我卸载了 MikTex，因为 texstudio 无法自动更新软件包。我想再次安装它。但是当我启动时却出现了这个错误sudo apt-get update：
Hit:1 http://pl.archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://pl.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:4 http://ppa.launchpad.net/sunderme/texstudio/ubuntu focal InRelease
Hit:5 http://pl.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:6 http://download.opensuse.org/repositories/Ubuntu:/debbuild/Ubuntu_20.04 InRelease
Hit:7 http://deb.playonlinux.com trusty InRelease
Hit:8 https://download.docker.com/linux/ubuntu focal InRelease
Hit:9 http://security.ubuntu.com/ubuntu focal-security InRelease
Ign:2 https://ftp.gust.org.pl/TeX/systems/win32/miktex/setup/deb focal InRelease
Err:11 https://ftp.gust.org.pl/TeX/systems/win32/miktex/setup/deb focal Release
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses insecure algorithm. Could not handshake: Error in the certificate verification. [IP: 158.75.62.5 443]
Ign:10 https://cvmrepo.web.cern.ch/cvmrepo/apt focal-prod InRelease
Hit:12 https://cvmrepo.web.cern.ch/cvmrepo/apt focal-prod Release
Reading package lists... Done
E: The repository 'http://miktex.org/download/ubuntu focal Release' no longer has a Release file.
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.
我试过了sudo apt install ca-certificates，但失败了。这也行不通如果存储库/PPA 没有 Release 文件，我该怎么办？
结果是：
~$ sudo ppa-purge ppa:mc3man/trusty-media
Updating packages lists
E: The repository 'http://miktex.org/download/ubuntu focal Release' no longer has a Release file.
Warning: apt-get update failed for some reason
~$ sudo apt-get update
Hit:1 http://pl.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://download.opensuse.org/repositories/Ubuntu:/debbuild/Ubuntu_20.04 InRelease
Hit:3 http://pl.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:4 http://ppa.launchpad.net/sunderme/texstudio/ubuntu focal InRelease
Hit:5 http://deb.playonlinux.com trusty InRelease
Hit:7 http://pl.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:9 https://download.docker.com/linux/ubuntu focal InRelease
Ign:6 https://ftp.gust.org.pl/TeX/systems/win32/miktex/setup/deb focal InRelease
Hit:11 http://security.ubuntu.com/ubuntu focal-security InRelease
Err:10 https://ftp.gust.org.pl/TeX/systems/win32/miktex/setup/deb focal Release
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses insecure algorithm. Could not handshake: Error in the certificate verification. [IP: 158.75.62.5 443]
Ign:8 https://cvmrepo.web.cern.ch/cvmrepo/apt focal-prod InRelease
Hit:12 https://cvmrepo.web.cern.ch/cvmrepo/apt focal-prod Release
Reading package lists... Done
E: The repository 'http://miktex.org/download/ubuntu focal Release' no longer has a Release file.
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.
现在我无法再次安装它。有帮助吗？
答案1
什么都不起作用。但是哈哈...我忽略了一周后可以再次安装它。
~$ sudo apt update
Hit:1 http://pl.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 https://download.docker.com/linux/ubuntu focal InRelease
Hit:3 http://ppa.launchpad.net/sunderme/texstudio/ubuntu focal InRelease
Get:4 http://pl.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [109 kB]
Hit:6 http://download.opensuse.org/repositories/Ubuntu:/debbuild/Ubuntu_20.04 InRelease
Get:7 http://pl.archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Hit:10 http://deb.playonlinux.com trusty InRelease
Get:8 https://sunsite.icm.edu.pl/pub/CTAN/systems/win32/miktex/setup/deb focal InRelease [2 030 B]
Get:11 http://pl.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [841 kB]
Ign:9 https://cvmrepo.web.cern.ch/cvmrepo/apt focal-prod InRelease
Get:12 http://pl.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [434 kB]
Get:13 http://pl.archive.ubuntu.com/ubuntu focal-updates/main amd64 DEP-11 Metadata [264 kB]
Get:14 http://pl.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [746 kB]
Get:16 http://pl.archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages [555 kB]
Get:17 http://pl.archive.ubuntu.com/ubuntu focal-updates/universe amd64 DEP-11 Metadata [302 kB]
Get:18 http://pl.archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 DEP-11 Metadata [2 468 B]
Hit:15 https://cvmrepo.web.cern.ch/cvmrepo/apt focal-prod Release
Get:19 http://pl.archive.ubuntu.com/ubuntu focal-backports/universe amd64 DEP-11 Metadata [1 768 B]
Get:20 http://security.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [24,2 kB]
Get:21 http://security.ubuntu.com/ubuntu focal-security/universe amd64 DEP-11 Metadata [58,2 kB]
Fetched 3 554 kB in 1s (2 409 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
4 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Skipping acquire of configured file 'stable/source/Sources' as repository 'https://download.docker.com/linux/ubuntu focal InRelease' does not seem to provide it (sources.list entry misspelt?)
N: Skipping acquire of configured file 'universe/binary-i386/Packages' as repository 'http://miktex.org/download/ubuntu focal InRelease' doesn't support architecture 'i386'
问题很简单
E: The repository 'http://miktex.org/download/ubuntu focal Release' no longer has a Release file.
就让它过去，然后等待。