1, change source.list from bionic to focal
deb http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse
#deb https://dl.winehq.org/wine-builds/ubuntu/ focal main
2, upgrade to xubuntu 20.04 Focal
$sudo apt update
$sudo apt dist-upgrade
3, fix xubuntu 20.04 issues
(3.1) chrome browser issue
chromium-browser需要首先安裝snap，改爲直接下載並安裝google-chrome
$sudo apt remove chromium-browser
$sudo apt autoremove --purge snapd
$wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
$sudo apt install ./google-chrome-stable_current_amd64.deb
拷貝chromium-browser的配置信息
$cp -r ~/.config/chromium/* ~/.config/google-chrome/
(3.2) vmware kernel module updater issue
refer to https://blog.csdn.net/Aginouxy/article/details/104652991
(3.3) steam issue
$sudo apt install steam
(3.4) hibernate grayed issue
$su
#cd /etc/polkit-1/localauthority/50-local.d
#vim com.ubuntu.enable-hibernate.pkla
#reboot
contents of 'com.ubuntu.enable-hibernate.pkla':
[Re-enable hibernate by default in upower]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes
[Re-enable hibernate by default in logind]
Identity=unix-user:*
Action=org.freedesktop.login1.hibernate;org.freedesktop.login1.handle-hibernate-key;org.freedesktop.login1;org.freedesktop.login1.hibernate-multiple-sessions;org.freedesktop.login1.hibernate-ignore-inhibit
ResultActive=yes
(3.5) xfce4-screensaver issue, use xscreensaver by default
$sudo apt remove xfce4-screensaver