我最近两天都收到这个错误。顶部栏上有一个红色图标，表示更新错误，缺少一些依赖项（不是确切的单词）。所以我尝试了一下，sudo apt-get update得到了下面的输出
Get:1 http://in.archive.ubuntu.com/ubuntu impish InRelease [270 kB]
Hit:2 http://dl.google.com/linux/chrome/deb stable InRelease
Get:3 http://archive.canonical.com/ubuntu impish InRelease [11.4 kB]
Hit:4 http://ppa.launchpad.net/obsproject/obs-studio/ubuntu impish InRelease
Get:5 http://security.ubuntu.com/ubuntu impish-security InRelease [110 kB]
Get:6 http://in.archive.ubuntu.com/ubuntu impish-updates InRelease [110 kB]
Err:3 http://archive.canonical.com/ubuntu impish InRelease
Splitting up /var/lib/apt/lists/partial/archive.canonical.com_ubuntu_dists_impish_InRelease into data and signature failed
Hit:7 http://in.archive.ubuntu.com/ubuntu impish-updates/main amd64 Packages
Ign:8 http://ppa.launchpad.net/slimbook/slimbook/ubuntu impish InRelease
Hit:9 http://in.archive.ubuntu.com/ubuntu impish-updates/main i386 Packages
Hit:10 http://in.archive.ubuntu.com/ubuntu impish-updates/main Translation-en
Hit:11 http://in.archive.ubuntu.com/ubuntu impish-updates/main amd64 DEP-11 Metadata
Hit:12 http://in.archive.ubuntu.com/ubuntu impish-updates/main DEP-11 48x48 Icons
Hit:13 http://in.archive.ubuntu.com/ubuntu impish-updates/main DEP-11 64x64 Icons
Hit:14 http://in.archive.ubuntu.com/ubuntu impish-updates/main DEP-11 64x64@2 Icons
Hit:15 http://in.archive.ubuntu.com/ubuntu impish-updates/main amd64 c-n-f Metadata
Hit:16 http://in.archive.ubuntu.com/ubuntu impish-updates/restricted amd64 Packages
Hit:17 http://in.archive.ubuntu.com/ubuntu impish-updates/restricted i386 Packages
Hit:18 http://in.archive.ubuntu.com/ubuntu impish-updates/restricted Translation-en
Hit:19 http://in.archive.ubuntu.com/ubuntu impish-updates/restricted amd64 c-n-f Metadata
Hit:20 http://in.archive.ubuntu.com/ubuntu impish-updates/universe i386 Packages
Hit:21 http://in.archive.ubuntu.com/ubuntu impish-updates/universe amd64 Packages
Hit:22 http://in.archive.ubuntu.com/ubuntu impish-updates/universe Translation-en
Hit:23 http://in.archive.ubuntu.com/ubuntu impish-updates/universe amd64 DEP-11 Metadata
Hit:24 http://in.archive.ubuntu.com/ubuntu impish-updates/universe DEP-11 48x48 Icons
Hit:25 http://in.archive.ubuntu.com/ubuntu impish-updates/universe DEP-11 64x64 Icons
Hit:26 http://in.archive.ubuntu.com/ubuntu impish-updates/universe DEP-11 64x64@2 Icons
Hit:27 http://in.archive.ubuntu.com/ubuntu impish-updates/universe amd64 c-n-f Metadata
Hit:28 http://in.archive.ubuntu.com/ubuntu impish-updates/multiverse i386 Packages
Hit:29 http://in.archive.ubuntu.com/ubuntu impish-updates/multiverse amd64 Packages
Hit:30 http://in.archive.ubuntu.com/ubuntu impish-updates/multiverse Translation-en
Hit:31 http://in.archive.ubuntu.com/ubuntu impish-updates/multiverse amd64 c-n-f Metadata
Err:5 http://security.ubuntu.com/ubuntu impish-security InRelease
Splitting up /var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_impish-security_InRelease into data and signature failed
Hit:32 http://ppa.launchpad.net/slimbook/slimbook/ubuntu impish Release
Reading package lists... Done
W: GPG error: http://archive.canonical.com/ubuntu impish InRelease: Splitting up /var/lib/apt/lists/partial/archive.canonical.com_ubuntu_dists_impish_InRelease into data and signature failed
E: The repository 'http://archive.canonical.com/ubuntu impish InRelease' is no longer signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://security.ubuntu.com/ubuntu impish-security InRelease: Splitting up /var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_impish-security_InRelease into data and signature failed
E: The repository 'http://security.ubuntu.com/ubuntu impish-security InRelease' is no longer signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
如果可以修复的话就太好了。
编辑1：
$ sudo apt-get update
Get:1 http://in.archive.ubuntu.com/ubuntu impish InRelease [270 kB]
Hit:2 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:3 http://in.archive.ubuntu.com/ubuntu impish-updates InRelease
Hit:4 http://archive.canonical.com/ubuntu impish InRelease
Hit:5 http://security.ubuntu.com/ubuntu impish-security InRelease
Hit:6 http://ppa.launchpad.net/kritalime/ppa/ubuntu impish InRelease
Hit:7 http://ppa.launchpad.net/obsproject/obs-studio/ubuntu impish InRelease
Ign:8 http://ppa.launchpad.net/slimbook/slimbook/ubuntu impish InRelease
Hit:9 http://ppa.launchpad.net/slimbook/slimbook/ubuntu impish Release
Fetched 270 kB in 2s (134 kB/s)
Reading package lists... Done
W: Skipping acquire of configured file 'partner/binary-i386/Packages' as repository 'http://archive.canonical.com/ubuntu impish InRelease' doesn't have the component 'partner' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'partner/binary-amd64/Packages' as repository 'http://archive.canonical.com/ubuntu impish InRelease' doesn't have the component 'partner' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'partner/i18n/Translation-en' as repository 'http://archive.canonical.com/ubuntu impish InRelease' doesn't have the component 'partner' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'partner/i18n/Translation-en_IN' as repository 'http://archive.canonical.com/ubuntu impish InRelease' doesn't have the component 'partner' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'partner/dep11/Components-amd64.yml' as repository 'http://archive.canonical.com/ubuntu impish InRelease' doesn't have the component 'partner' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'partner/dep11/icons-48x48.tar' as repository 'http://archive.canonical.com/ubuntu impish InRelease' doesn't have the component 'partner' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'partner/dep11/icons-64x64.tar' as repository 'http://archive.canonical.com/ubuntu impish InRelease' doesn't have the component 'partner' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'partner/dep11/[email protected]' as repository 'http://archive.canonical.com/ubuntu impish InRelease' doesn't have the component 'partner' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'partner/cnf/Commands-amd64' as repository 'http://archive.canonical.com/ubuntu impish InRelease' doesn't have the component 'partner' (component misspelt in sources.list?)
编辑2：
$ sudo apt-get update
[sudo] password for njan:
Get:1 http://in.archive.ubuntu.com/ubuntu impish InRelease [270 kB]
Hit:2 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:3 http://ppa.launchpad.net/kritalime/ppa/ubuntu impish InRelease
Hit:4 http://in.archive.ubuntu.com/ubuntu impish-updates InRelease
Hit:5 http://security.ubuntu.com/ubuntu impish-security InRelease
Hit:6 http://archive.canonical.com/ubuntu impish InRelease
Hit:7 http://ppa.launchpad.net/obsproject/obs-studio/ubuntu impish InRelease
Get:8 http://ppa.launchpad.net/slimbook/slimbook/ubuntu impish InRelease [18.1 kB]
Err:5 http://security.ubuntu.com/ubuntu impish-security InRelease
Splitting up /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_impish-security_InRelease into data and signature failed
Err:6 http://archive.canonical.com/ubuntu impish InRelease
Splitting up /var/lib/apt/lists/archive.canonical.com_ubuntu_dists_impish_InRelease into data and signature failed
Fetched 288 kB in 2s (172 kB/s)
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.ubuntu.com/ubuntu impish-security InRelease: Splitting up /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_impish-security_InRelease into data and signature failed
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com/ubuntu impish InRelease: Splitting up /var/lib/apt/lists/archive.canonical.com_ubuntu_dists_impish_InRelease into data and signature failed
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/impish/InRelease Splitting up /var/lib/apt/lists/archive.canonical.com_ubuntu_dists_impish_InRelease into data and signature failed
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/impish-security/InRelease Splitting up /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_impish-security_InRelease into data and signature failed
W: Some index files failed to download. They have been ignored, or old ones used instead.