AppImage not working in Ubuntu 23.04 problem.Ubuntu 23.04 comes with a newer version of FUSE (Filesystem in UserSpace) ( FUSE 3). But most AppImages require and need the old FUSE 2 version to run.
Note: If you upgrade from the older Ubuntu version to the new Ubuntu 23.04. Then you don’t need to install FUSE2. You already have the latest FUSE 2 in your system. and the AppImage will work without any problem.
How to Activate AppImage Support in Ubuntu 23.04
You need to install the older version of FUSE 2 on your Ubuntu system.
Install FUSE 2 On Ubuntu 23.04
Open the terminal application using the ctrl+alt+t keys and run the below command.
sudo apt install libfuse2
It will install the FUSE 2 on your system and now you can run any AppImage portable file.