Howto fix bugs on Ubuntu 22.04 LTS

Face up the black screen when recording screen with `Kazam` and `OBS Studio`

Fix it by disabling Wayland

Comment out WaylandEnable=false in /etc/gdm3/custom.conf
Logout and login again

Cannot ssh on Ubuntu 22.04 LTS

After connected OpenVPN Server, then can ping, but cannot ssh Add MACs hmac-sha2-256 into /etc/ssh/ssh_config or ~/.ssh/config as a workaround

Can connect L2TP VPN on Ubuntu 21.10 or before but cannot on Ubuntu 22.04

sudo apt remove xl2tpd
curl -LO http://archive.ubuntu.com/ubuntu/pool/universe/x/xl2tpd/xl2tpd_1.3.12-1.1_amd64.deb
sudo apt install ./xl2tpd_1.3.12-1.1_amd64.deb
sudo apt-mark hold xl2tpd

Error when running AppImage on Ubuntu 22.04 LTS

dlopen(): error loading libfuse.so.2

AppImages require FUSE to run. 
You might still be able to extract the contents of this AppImage 
if you run it with the --appimage-extract option. 
See https://github.com/AppImage/AppImageKit/wiki/FUSE 
for more information

Install libfuse2 as a workaround: sudo apt install libfuse2

Screen is flickering in Ubuntu 22.04

In file /etc/default/grub, I added to parameter GRUB_CMDLINE_LINUX_DEFAULT:

i915.enable_dc=0
intel_idle.max_cstate=2

Then, let do update-grub

The last kernel without the flickering for me was the kernel that shipped with 21.10.
Reference: https://bugs.launchpad.net/ubuntu/ source/linux/ bug/1970426/comments/24

nhthai2005/fix_bugs_ubuntu_22.04.md