我做了两件事：安装了这套新的浅色主题http://www.omgubuntu.co.uk/2017/05/install-improved-ambiance-gnome-theme（适用于 16.10 和 17.04，我使用的是 16.04，我没有注意到它不兼容）并通过添加其 ppa 和运行 dist-upgrade 来更新 mesa 驱动程序。
重启后，时钟指示器消失了，nautilus 的显示类似于 gnome，中央证券（带有 ubuntu 主题的黑角），桌面图标变大，全局菜单中只有“文件”部分，右键菜单不会显示某些部分，留下空白（您可以按它，它可以工作但没有文本）。
运行sudo apt remove light-themes=16.10+17.10.20170515.1-0ubuntu1和安装后14.04+16.04.20160415-0ubuntu1它只解决了右键菜单问题。有人知道是什么原因导致了这些问题以及如何修复它们吗？
更新：Running sudo ppa-purge ppa:ubuntu-x-swat/updates返回：
Updating packages lists
W: The repository 'http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_15.04 Release' does not have a Release file.
W: The repository 'http://ppa.launchpad.net/hamish-twaddle/ppa/ubuntu xenial Release' does not have a Release file.
W: GPG error: http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A7D1D38BEB6D886
W: The repository 'http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release' is not signed.
E: Failed to fetch http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_15.04/Packages 404 Not Found
E: Failed to fetch http://ppa.launchpad.net/hamish-twaddle/ppa/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Warning: apt-get update failed for some reason
更新2：
W: The repository 'http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_15.04 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/hamish-twaddle/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.
W: GPG error: http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A7D1D38BEB6D886
W: The repository 'http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release' is not signed.
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/hamish-twaddle/ppa/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Failed to fetch http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_15.04/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
答案1
我不能肯定地说，但由于与系统不兼容，而且本身就有 bug，升级 Mesa 可能会导致这些问题。我之前升级 Mesa 和我的图形驱动程序时，它给我的机器带来了极大的麻烦，因为 Ubuntu 的设计只适用于某些版本，而不是最新版本，所以在很多情况下，它会把一切都搞乱。
有一个名为的实用程序ppa-purge，您可以使用它来降级（到官方存储库版本）并卸载来自特定 PPA 的所有软件包，可以使用以下命令安装：
sudo apt-get install ppa-purge
跑步：
sudo ppa-purge ppa:ubuntu-x-swat/updates
应该可以解决您的问题，请确保在完成后重新启动。