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FUSE
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 install fuse
sudo modprobe fuse
sudo groupadd fuse
user="$(whoami)"
sudo usermod -a -G fuse $user
For example, on openSUSE:
sudo zypper install fuse
In order to use fusermount on OpenSUSE with the default (?) "secure" file permission settings (see /etc/permissions.secure), your login needs to be part of the trusted group. To add yourself, run
sudo usermod -a -G trusted `whoami`
Then log out and log in for the change to take effect.
For example, on CentOS/RHEL:
yum --enablerepo=epel -y install fuse-sshfs # install from EPEL
user="$(whoami)"
usermod -a -G fuse "$user"
For example, on Armbian 64-bit systems (e.g., for the Pine64) you need to install 32-bit libfuse2 in order to run 32-bit AppImages such as the MuseScore one:
sudo apt install libfuse2:armhf
For example, on Clear Linux OS:
sudo su
mkdir -p /etc/modules-load.d/
echo "fuse" > /etc/modules-load.d/fuse.conf
reboot
This may be a bug, please see https://github.com/clearlinux/distribution/issues/273.
Chrome OS, Chromium OS, Crostini:
FUSE is not operational out of the box, but installation is simple after version 73:
sudo apt install fuse
check https://bugs.chromium.org/p/chromium/issues/detail?id=841787 for details
If you don't want to install FUSE, you can either mount or extract the AppImage.
To extract the contents of the AppImage, simply run the AppImage with --appimage-extract.
If the above does not work, you may still have an older type-1 AppImage. To mount the AppImage and run the application, simply run
sudo mount -o loop Some.AppImage /mnt
/mnt/AppRun
A type-1 AppImage is an ISO, so
sudo apt install libarchive-tools # Or any other method to get `bsdtar`
mkdir AppDir
cd AppDir
bsdtar xfp /home/me/Downloads/Some.AppImage
./AppRun
also works.
When running an AppImage from a Docker container you will get the following error:
fuse: failed to open /dev/fuse: Operation not permitted
Could not mount AppImage
Please see https://github.com/probonopd/AppImageKit/wiki/FUSE
You'll often hear "oh, just add these arguments to docker run
--cap-add SYS_ADMIN --cap-add MKNOD --device /dev/fuse:mrw and it'll work", but that is considered to be insecure.
Instead, just use the --appimage-extract-and-run parameter to the AppImage in your build script:
[...]
./appimagetool-*.AppImage --appimage-extract-and-run ...
[...]
Note: appimagetool-*.AppImage can be extracted starting with release version 9
If you want to decide whether to use the AppImage directly or extracted depending on whether you're in a container or not, for example in a build script, you can combine this with some detection code.
https://docs.appimage.org/user-guide/run-appimages.html?#troubleshooting