(作者 海丁香）
输入命令：
apt-get update
更新出错：
Err:1 http://mirrors.163.com/debian buster InRelease
Temporary failure resolving 'mirrors.163.com'
Err:2 http://mirrors.163.com/debian buster-updates InRelease
Temporary failure resolving 'mirrors.163.com'
Err:3 http://mirrors.163.com/debian buster-backports InRelease
Temporary failure resolving 'mirrors.163.com'
Err:4 http://mirrors.163.com/debian-security buster/updates InRelease
Temporary failure resolving 'mirrors.163.com'
Err:5 https://mirrors.ustc.edu.cn/debian unstable InRelease
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:6 https://mirrors.ustc.edu.cn/debian experimental InRelease
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:7 https://mirrors.ustc.edu.cn/debian buster InRelease
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:8 https://mirrors.ustc.edu.cn/debian buster-updates InRelease
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:9 https://mirrors.ustc.edu.cn/debian buster-proposed-updates InRelease
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:10 https://mirrors.ustc.edu.cn/debian-security buster/updates InRelease
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:11 https://mirrors.ustc.edu.cn/debiancn buster InRelease
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:12 https://mirrors.ustc.edu.cn/deb-multimedia buster InRelease
Temporary failure resolving 'mirrors.ustc.edu.cn'
Reading package lists... Done
W: Failed to fetch http://mirrors.163.com/debian/dists/buster/InRelease Temporary failure resolving 'mirrors.163.com'
W: Failed to fetch http://mirrors.163.com/debian/dists/buster-updates/InRelease Temporary failure resolving 'mirrors.163.com'
W: Failed to fetch http://mirrors.163.com/debian/dists/buster-backports/InRelease Temporary failure resolving 'mirrors.163.com'
W: Failed to fetch http://mirrors.163.com/debian-security/dists/buster/updates/InRelease Temporary failure resolving 'mirrors.163.com'
W: Failed to fetch https://mirrors.ustc.edu.cn/debian/dists/unstable/InRelease Temporary failure resolving 'mirrors.ustc.edu.cn'
W: Failed to fetch https://mirrors.ustc.edu.cn/debian/dists/experimental/InRelease Temporary failure resolving 'mirrors.ustc.edu.cn'
W: Failed to fetch https://mirrors.ustc.edu.cn/debian/dists/buster/InRelease Temporary failure resolving 'mirrors.ustc.edu.cn'
W: Failed to fetch https://mirrors.ustc.edu.cn/debian/dists/buster-updates/InRelease Temporary failure resolving 'mirrors.ustc.edu.cn'
W: Failed to fetch https://mirrors.ustc.edu.cn/debian/dists/buster-proposed-updates/InRelease Temporary failure resolving 'mirrors.ustc.edu.cn'
W: Failed to fetch https://mirrors.ustc.edu.cn/debian-security/dists/buster/updates/InRelease Temporary failure resolving 'mirrors.ustc.edu.cn'
W: Failed to fetch https://mirrors.ustc.edu.cn/debiancn/dists/buster/InRelease Temporary failure resolving 'mirrors.ustc.edu.cn'
W: Failed to fetch https://mirrors.ustc.edu.cn/deb-multimedia/dists/buster/InRelease Temporary failure resolving 'mirrors.ustc.edu.cn'
W: Some index files failed to download. They have been ignored, or old ones used instead.
输入命令：
apt-get install fcitx
安装出错：
Err:1 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libdouble-conversion3 amd64 3.1.5-3
Temporary failure resolving 'mirrors.ustc.edu.cn'
Ign:2 http://mirrors.163.com/debian buster/main amd64 libxcb-icccm4 amd64 0.4.1-1.1
Err:3 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libqt5core5a amd64 5.12.5+dfsg-2
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:4 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libqt5dbus5 amd64 5.12.5+dfsg-2
Temporary failure resolving 'mirrors.ustc.edu.cn'
Ign:5 http://mirrors.163.com/debian buster/main amd64 libxcb-image0 amd64 0.4.0-1+b2
Ign:6 http://mirrors.163.com/debian buster/main amd64 libxcb-keysyms1 amd64 0.4.0-1+b2
Err:7 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libqt5network5 amd64 5.12.5+dfsg-2
Temporary failure resolving 'mirrors.ustc.edu.cn'
Ign:8 http://mirrors.163.com/debian buster/main amd64 libxcb-randr0 amd64 1.13.1-2
Ign:9 http://mirrors.163.com/debian buster/main amd64 libxcb-render-util0 amd64 0.3.9-1+b1
Err:10 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libxkbcommon-x11-0 amd64 0.9.1-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:11 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libqt5gui5 amd64 5.12.5+dfsg-2
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:12 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libqt5widgets5 amd64 5.12.5+dfsg-2
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:13 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libqt5svg5 amd64 5.12.5-2
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:14 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libfcitx-utils0 amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:15 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libfcitx-config4 amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:16 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libfcitx-core0 amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:17 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libgettextpo0 amd64 0.19.8.1-10
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:18 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-bin amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:19 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-data all 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:20 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libjson-c4 amd64 0.13.1+dfsg-6
Temporary failure resolving 'mirrors.ustc.edu.cn'
Ign:21 http://mirrors.163.com/debian buster/main amd64 libxcb-xinerama0 amd64 1.13.1-2
Ign:22 http://mirrors.163.com/debian buster/main amd64 libxcb-xinput0 amd64 1.13.1-2
Ign:23 http://mirrors.163.com/debian buster/main amd64 libxcb-xkb1 amd64 1.13.1-2
Ign:24 http://mirrors.163.com/debian buster/main amd64 libtinyxml2.6.2v5 amd64 2.6.2-4
Ign:25 http://mirrors.163.com/debian buster/main amd64 libpresage-data all 0.9.1-2.1
Ign:26 http://mirrors.163.com/debian buster/main amd64 libpresage1v5 amd64 0.9.1-2.1+b2
Ign:27 http://mirrors.163.com/debian buster/main amd64 fcitx-config-common all 0.4.10-2
Ign:28 http://mirrors.163.com/debian buster/main amd64 fcitx-config-gtk amd64 0.4.10-2
Ign:29 http://mirrors.163.com/debian buster/main amd64 im-config all 0.43-1
Ign:30 http://mirrors.163.com/debian buster/main amd64 presage amd64 0.9.1-2.1+b2
Err:31 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-modules amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:32 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx all 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:33 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libfcitx-gclient1 amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:34 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-frontend-all all 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:35 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-module-dbus amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:36 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-frontend-gtk2 amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:37 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-frontend-gtk3 amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:38 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-frontend-qt5 amd64 1.2.4-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:39 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-module-kimpanel amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:40 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-module-lua amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:41 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-module-x11 amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:42 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx-ui-classic amd64 1:4.2.9.7-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:43 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libfcitx-qt5-data all 1.2.4-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:44 https://mirrors.ustc.edu.cn/debian unstable/main amd64 libfcitx-qt5-1 amd64 1.2.4-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:45 https://mirrors.ustc.edu.cn/debian unstable/main amd64 fcitx5-module-quickphrase-editor amd64 1.2.4-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:46 https://mirrors.ustc.edu.cn/debian unstable/main amd64 qt5-gtk-platformtheme amd64 5.12.5+dfsg-2
Temporary failure resolving 'mirrors.ustc.edu.cn'
Err:47 https://mirrors.ustc.edu.cn/debian unstable/main amd64 qttranslations5-l10n all 5.12.5-1
Temporary failure resolving 'mirrors.ustc.edu.cn'
Ign:2 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-icccm4 amd64 0.4.1-1.1
Ign:5 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-image0 amd64 0.4.0-1+b2
Ign:6 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-keysyms1 amd64 0.4.0-1+b2
Ign:8 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-randr0 amd64 1.13.1-2
Ign:9 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-render-util0 amd64 0.3.9-1+b1
Ign:21 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-xinerama0 amd64 1.13.1-2
Ign:22 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-xinput0 amd64 1.13.1-2
Ign:23 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-xkb1 amd64 1.13.1-2
Ign:24 https://mirrors.ustc.edu.cn/debian buster/main amd64 libtinyxml2.6.2v5 amd64 2.6.2-4
Ign:25 https://mirrors.ustc.edu.cn/debian buster/main amd64 libpresage-data all 0.9.1-2.1
Ign:26 https://mirrors.ustc.edu.cn/debian buster/main amd64 libpresage1v5 amd64 0.9.1-2.1+b2
Ign:27 https://mirrors.ustc.edu.cn/debian buster/main amd64 fcitx-config-common all 0.4.10-2
Ign:28 https://mirrors.ustc.edu.cn/debian buster/main amd64 fcitx-config-gtk amd64 0.4.10-2
Ign:29 https://mirrors.ustc.edu.cn/debian buster/main amd64 im-config all 0.43-1
Ign:30 https://mirrors.ustc.edu.cn/debian buster/main amd64 presage amd64 0.9.1-2.1+b2
Err:2 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-icccm4 amd64 0.4.1-1.1
Temporary failure resolving 'mirrors.163.com'
Err:5 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-image0 amd64 0.4.0-1+b2
Temporary failure resolving 'mirrors.163.com'
Err:6 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-keysyms1 amd64 0.4.0-1+b2
Temporary failure resolving 'mirrors.163.com'
Err:8 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-randr0 amd64 1.13.1-2
Temporary failure resolving 'mirrors.163.com'
Err:9 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-render-util0 amd64 0.3.9-1+b1
Temporary failure resolving 'mirrors.163.com'
Err:21 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-xinerama0 amd64 1.13.1-2
Temporary failure resolving 'mirrors.163.com'
Err:22 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-xinput0 amd64 1.13.1-2
Temporary failure resolving 'mirrors.163.com'
Err:23 https://mirrors.ustc.edu.cn/debian buster/main amd64 libxcb-xkb1 amd64 1.13.1-2
Temporary failure resolving 'mirrors.163.com'
Err:24 https://mirrors.ustc.edu.cn/debian buster/main amd64 libtinyxml2.6.2v5 amd64 2.6.2-4
Temporary failure resolving 'mirrors.163.com'
Err:25 https://mirrors.ustc.edu.cn/debian buster/main amd64 libpresage-data all 0.9.1-2.1
Temporary failure resolving 'mirrors.163.com'
Err:26 https://mirrors.ustc.edu.cn/debian buster/main amd64 libpresage1v5 amd64 0.9.1-2.1+b2
Temporary failure resolving 'mirrors.163.com'
Err:27 https://mirrors.ustc.edu.cn/debian buster/main amd64 fcitx-config-common all 0.4.10-2
Temporary failure resolving 'mirrors.163.com'
Err:28 https://mirrors.ustc.edu.cn/debian buster/main amd64 fcitx-config-gtk amd64 0.4.10-2
Temporary failure resolving 'mirrors.163.com'
Err:29 https://mirrors.ustc.edu.cn/debian buster/main amd64 im-config all 0.43-1
Temporary failure resolving 'mirrors.163.com'
Err:30 https://mirrors.ustc.edu.cn/debian buster/main amd64 presage amd64 0.9.1-2.1+b2
Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/d/double-conversion/libdouble-conversion3_3.1.5-3_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/q/qtbase-opensource-src/libqt5core5a_5.12.5+dfsg-2_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/q/qtbase-opensource-src/libqt5dbus5_5.12.5+dfsg-2_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/q/qtbase-opensource-src/libqt5network5_5.12.5+dfsg-2_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/x/xcb-util-wm/libxcb-icccm4_0.4.1-1.1_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/x/xcb-util-image/libxcb-image0_0.4.0-1+b2_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/x/xcb-util-keysyms/libxcb-keysyms1_0.4.0-1+b2_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/libx/libxcb/libxcb-randr0_1.13.1-2_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/x/xcb-util-renderutil/libxcb-render-util0_0.3.9-1+b1_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/libx/libxcb/libxcb-xinerama0_1.13.1-2_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/libx/libxcb/libxcb-xinput0_1.13.1-2_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/libx/libxcb/libxcb-xkb1_1.13.1-2_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/libx/libxkbcommon/libxkbcommon-x11-0_0.9.1-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/q/qtbase-opensource-src/libqt5gui5_5.12.5+dfsg-2_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/q/qtbase-opensource-src/libqt5widgets5_5.12.5+dfsg-2_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/q/qtsvg-opensource-src/libqt5svg5_5.12.5-2_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/libfcitx-utils0_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/libfcitx-config4_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/libfcitx-core0_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/g/gettext/libgettextpo0_0.19.8.1-10_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-bin_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-data_4.2.9.7-1_all.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/j/json-c/libjson-c4_0.13.1+dfsg-6_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/t/tinyxml/libtinyxml2.6.2v5_2.6.2-4_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/p/presage/libpresage-data_0.9.1-2.1_all.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/p/presage/libpresage1v5_0.9.1-2.1+b2_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-modules_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx_4.2.9.7-1_all.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx-configtool/fcitx-config-common_0.4.10-2_all.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/libfcitx-gclient1_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx-configtool/fcitx-config-gtk_0.4.10-2_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-frontend-all_4.2.9.7-1_all.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-module-dbus_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-frontend-gtk2_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-frontend-gtk3_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx-qt5/fcitx-frontend-qt5_1.2.4-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-module-kimpanel_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-module-lua_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-module-x11_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx/fcitx-ui-classic_4.2.9.7-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx-qt5/libfcitx-qt5-data_1.2.4-1_all.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx-qt5/libfcitx-qt5-1_1.2.4-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/f/fcitx-qt5/fcitx5-module-quickphrase-editor_1.2.4-1_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/i/im-config/im-config_0.43-1_all.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/p/presage/presage_0.9.1-2.1+b2_amd64.deb Temporary failure resolving 'mirrors.163.com'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/q/qtbase-opensource-src/qt5-gtk-platformtheme_5.12.5+dfsg-2_amd64.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Failed to fetch https://mirrors.ustc.edu.cn/debian/pool/main/q/qttranslations-opensource-src/qttranslations5-l10n_5.12.5-1_all.deb Temporary failure resolving 'mirrors.ustc.edu.cn'
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
解决方案：
原因可能是之前使用了autoremove，已经在重装系统。
