我只是想vanilla-gnome-desktop通过以下方式安装
apt install vanilla-gnome-desktop
...为了获得比 Ubuntu Desktop 18.04 上的默认设置更普通的 GNOME 体验。
它第一次就出错了，并且该问题似乎无法apt install仅通过以下任一方法来解决：
# apt install vanilla-gnome-desktop
Reading package lists... Done
Building dependency tree
Reading state information... Done
vanilla-gnome-desktop is already the newest version (0.83).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up plymouth-theme-ubuntu-gnome-logo (18.04.0) ...
update-alternatives: error: alternative link /usr/share/plymouth/themes/default.grub is already managed by default.grub
dpkg: error processing package plymouth-theme-ubuntu-gnome-logo (--configure):
installed plymouth-theme-ubuntu-gnome-logo package post-installation script subprocess returned error exit status 2
Errors were encountered while processing:
plymouth-theme-ubuntu-gnome-logo
E: Sub-process /usr/bin/dpkg returned an error code (1)
所以无论如何，我之前已经清除了软件包plymouth-theme-ubuntu-logo并且plymouth-theme-ubuntu-text已安装 plymouth-disabler。
我还为自己创建了一个小文件，/etc/grub-black-and-white其中包含：
if background_color 0,0,0,0; then
clear
fi
我通过它“安装”了
update-alternatives --install /usr/share/plymouth/themes/default.grub default.grub /etc/grub-black-and-white 100
但是，我必须删除该 ( update-alternatives --remove default.grub /etc/grub-black-and-white) 才能plymouth-theme-ubuntu-gnome-logo正确安装，从而解决上述问题。
但现在当我想重新实例化我的固定/usr/share/plymouth/themes/default.grub，指向 时/etc/grub-black-and-white，它再次抱怨：
# update-alternatives --install /usr/share/plymouth/themes/default.grub default.grub /etc/grub-black-and-white 100
update-alternatives: error: alternative link /usr/share/plymouth/themes/default.grub is already managed by default.plymouth
虽然我显然可以再次手动覆盖它，但我的目标是让我的设置优先于某些包选择的任何/usr/share/plymouth/themes/default.grub内容坚持。
有没有办法实现这一点update-alternatives？如何？