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AppImages require FUSE to run. Filesystem in Userspace (FUSE) is a system that lets non-root users mount filesystems.
Many distributions have a working FUSE setup out-of-the-box. However if it is not working for you, you may need to install and configure FUSE manually.
For example, on Ubuntu:
sudo apt-get install fuse sudo modprobe fuse user="$(whoami)" sudo usermod -a -G fuse $user
For example, on openSUSE:
sudo zypper install fuse
For example, on CentOS/RHEL:
yum --enablerepo=epel -y install fuse-sshfs # install from EPEL user="$(whoami)" usermod -G fuse "$user"
If you don't want to install FUSE, you can either mount or extract the AppImage.
To mount the AppImage and run the application, simply run
sudo mount -o loop Some.AppImage /mnt /mnt/AppRun
If that does not work, you might have an experimental type 2 AppImage. These require you to pass
-o offset=... to the
mount command. Run the AppImage with
--appimage-offset to find out the correct number for the offset.