我一直在使用安装了 Kubuntu 桌面环境的 Ubuntu MATE 20.04。我安装了 Elementary 桌面只是为了体验一下，但我不喜欢它，然后我尝试删除 PPA 并返回到 kde 桌面环境。
grub 仍然被更改，Plymouth 屏幕消失，取而代之的是显示启动文本，kde 主题受到影响。但我可以通过从 Synaptic 包管理器中删除基本包（启动文本除外）来扭转这些局面。
现在没有购电协议Elementary 的，但操作系统名称仍然发生了变化。我认为 Ubuntu 的一些基本文件已被覆盖。
结果sudo apt --reinstall install base-files/xenial-updates：
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Release 'xenial-updates' for 'base-files' was not found
结果lsb_release -a：
No LSB modules are available.
Distributor ID: Elementary
Description: elementary OS 6 Early Access
Release: 6
Codename: odin
结果dpkg -l | grep -i elementary：
ii base-files 11ubuntu5.3+elementary11~ubuntu20.04.1 amd64 Debian base system miscellaneous files
ii libmalcontent-0-0:amd64 0.10.0-1+elementary3~ubuntu6.1 amd64 library for parental control of applications
ii libplymouth5:amd64 0.9.4git20200323-0ubuntu6.2+elementary2~ubuntu6.1 amd64 graphical boot animation and logger - shared libraries
ii libreoffice-style-elementary 1:6.4.6-0ubuntu0.20.04.1 all office productivity suite -- Elementary symbol style
ii lsb-base 11.1.0ubuntu2+elementary2~ubuntu6.0.1 all Linux Standard Base init script functionality
ii lsb-release 11.1.0ubuntu2+elementary2~ubuntu6.0.1 all Linux Standard Base version reporting utility
ii plymouth 0.9.4git20200323-0ubuntu6.2+elementary2~ubuntu6.1 amd64 boot animation, logger and I/O multiplexer
ii plymouth-label 0.9.4git20200323-0ubuntu6.2+elementary2~ubuntu6.1 amd64 boot animation, logger and I/O multiplexer - label control
ii plymouth-theme-elementary 5.9.0+r16~daily~ubuntu6.1 all graphical boot animation and logger
ii plymouth-theme-spinner 0.9.4git20200323-0ubuntu6.2+elementary2~ubuntu6.1 amd64 boot animation, logger and I/O multiplexer - spinner theme
ii plymouth-theme-ubuntu-text 0.9.4git20200323-0ubuntu6.2+elementary2~ubuntu6.1 amd64 boot animation, logger and I/O multiplexer - ubuntu text theme
kde 系统信息显示Ubuntu 6，但 neofetch 显示：
OS: elementary OS 6 Early Access x86_64
Host: B550M G10a
Kernel: 5.11.0-051100-generic
Uptime: 16 mins
Packages: 3744 (dpkg), 23 (flatpak), 16 (snap)
Shell: zsh 5.8
Resolution: 1366x768
DE: Plasma
WM: KWin
WM Theme: Lightly
Theme: Adapta [Plasma], Breeze [GTK2/3]
Icons: Fluent-green-dark [Plasma], Fluent-green-dark [GTK2/3]
Terminal: konsole
Terminal Font: Monospace 9
CPU: AMD Ryzen 5 PRO 4650G with Radeon Graphics (12) @ 3.700GHz
GPU: AMD ATI 0e:00.0 Renoir
Memory: 2141MiB / 15450MiB
结果sudo do-release-upgrade -d：
Checking for a new Ubuntu release
Upgrades to the development release are only
available from the latest supported release.
有没有办法将操作系统重命名为 Ubuntu 并恢复 Plymouth 屏幕？更重要的是，当升级发布时，我可以更新到 Ubuntu 21.04 吗？