re feos: Ubuntu versioning is a bit weird. greysondn has published a package for Bionic Beaver (Ubuntu 18.04) but nothing for Focal Fossa (Ubuntu 20.04), thus there is no valid package for apt to install. You could attempt to manually install the
deb (
i386) (the command, iirc, is
sudo dpkg -i XXX.deb), though as it was intended for a different version, it's possible (likely) that it will be unable to find the required dependencies and fail to install, as dependency names can change a lot between Ubuntu updates with some packages being added and others removed. The best fix would be asking them nicely to update it (via the tasvideos discord?)
Also, while I'm here, figure I should mention to forum folks that kilaye has made lots of progress on running the native flash player in libTAS in the past month with some games (afaik!) being TASable! You can check the progress
here.