卸载无用内核
dpkg --get-selections |grep linux-image
linux-image-5.8.0-25-generic install
linux-image-generic-hwe-20.04 install

apt remove linux-image-generic-hwe-20.04
apt autoremove

禁止自动更新
1 apt-mark hold linux-image-5.8.0-25-generic or apt-mark hold linux-image-generic linux-headers-generic
2 vi /etc/apt/apt.conf.d/10periodic
APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";
APT::Periodic::Unattended-Upgrade "0";
3 vi /etc/apt/apt.conf.d/20auto-upgrades
APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";
APT::Periodic::Unattended-Upgrade "0";

卸载桌面
apt remove gnome-shell gnome
apt autoremove
apt purge gnome
apt autoclean
apt clean

apt remove ubuntu-desktop

apt remove libreoffice-common
apt remove thunderbird totem rhythmbox empathy brasero simple-scan gnome-mahjongg aisleriot gnome-mines cheese transmission-common gnome-orca gnome-sudoku