After upgrading from Ubuntu 21.10 to 22.04 on my Lenovo X1 Gen 5, I had the following issues:

1. The built in video player (Totem) would display H.264 AVC videos squished to the far
left of the video window and only black and white. This appears to be a problem with vaapi, as the following command fixed it:

sudo apt remove gstreamer1.0-vaapi

2. Desktop icons disappeared. Had to manually run:

sudo apt install gnome-shell-extension-desktop-icons-ng

3. Firefox (snap) refused to display a file dialog for uploading files to websites (or download any files) until I manually installed:

sudo apt install xdg-desktop-portal-gtk

3. OpenShot video editor 2.6.1 refused to run. This is more of an issue of 2.6.1 not being compatable with the latest desktop that Ubuntu is using, but to fix it is annoying, as OpenShot has not had an official release since 2.6.1 in Sep 2021. You have to use the “Dailies” appImage (or install from the most up to date source yourself) to get a working OpenShot.

4. When trying to open a file on the desktop using the “find software” dialog, I got an error message “Failed to start GNOME software”, which was solved by:

sudo apt install gnome-software

5. Thumbnails would not show up for video files in the file browser, until I installed:

sudo apt install ffmpegthumbnailer