我正在尝试安装 16.04 的最新更新，以便升级到 18.04。我遇到了 phpMyAdmin PPA 错误，我理解这是由于原软件包维护者（nijel）已删除 PPA。
Ign:20 http://ppa.launchpad.net/nijel/phpmyadmin/ubuntu xenial/main amd64 Packages
Ign:13 http://ppa.launchpad.net/nijel/phpmyadmin/ubuntu xenial/main all Packages
Ign:14 http://ppa.launchpad.net/nijel/phpmyadmin/ubuntu xenial/main Translation-en_US
Ign:21 http://ppa.launchpad.net/nijel/phpmyadmin/ubuntu xenial/main Translation-en
Err:16 http://ppa.launchpad.net/phpmyadmin/ppa/ubuntu xenial/main amd64 Packages
404 Not Found [IP: 91.189.95.83 80]
Ign:17 http://ppa.launchpad.net/phpmyadmin/ppa/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/phpmyadmin/ppa/ubuntu xenial/main Translation-en_US
Ign:19 http://ppa.launchpad.net/phpmyadmin/ppa/ubuntu xenial/main Translation-en
Err:20 http://ppa.launchpad.net/nijel/phpmyadmin/ubuntu xenial/main amd64 Packages
403 Forbidden [IP: 91.189.95.83 80]
Ign:21 http://ppa.launchpad.net/nijel/phpmyadmin/ubuntu xenial/main Translation-en
Fetched 2,313 kB in 4s (486 kB/s)
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/nijel/phpmyadmin/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ppa.launchpad.net/phpmyadmin/ppa/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/phpmyadmin/ppa/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found [IP: 91.189.95.83 80]
E: Failed to fetch http://ppa.launchpad.net/nijel/phpmyadmin/ubuntu/dists/xenial/main/binary-amd64/Packages 403 Forbidden [IP: 91.189.95.83 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
因此我尝试删除 PPA：
sudo add-apt-repository --remove ppa:nijel/phpmyadmin
但这不起作用：
Cannot add PPA: 'ppa:~nijel/ubuntu/phpmyadmin'.
The user named '~nijel' has no PPA named 'ubuntu/phpmyadmin'
Please choose from the following available PPAs:
我也尝试过这个：
sudo add-apt-repository universe
'universe' distribution component is already enabled for all sources.
sudo apt install phpmyadmin
但我明白：
Reading package lists... Done
Building dependency tree
Reading state information... Done
phpmyadmin is already the newest version (4:4.6.6-1+deb.cihar.com~xenial.2).
我该如何解决这个问题以便可以升级到 18.04？
答案1
你必须通过以下方式从系统中删除 PPA
sudo mv /etc/apt/sources.list.d/*nijel*.list ~/
sudo add-apt-repository -r ppa:phpmyadmin/ppa
然后将phpmyadmin包还原为来自官方存储库的版本：
sudo apt-get install --reinstall phpmyadmin=4:4.5.4.1-2ubuntu2.1
然后运行sudo apt-get update以确保错误消失并再次运行sudo do-release-upgrade。