Install latest/stable of gThumb
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install gthumb-unofficial
Don't have snapd? Get set up for snaps.
gThumb allows the filesystem to be browsed for images. They can be organized into catalogs, or viewed as a slideshow. Folders and catalogs can be bookmarked, and comments can be added to images.
This snap exists because the archive version does not have AVIF support.
To access removable media you have to connect the interface manually:
sudo snap connect gthumb-unofficial:removable-media :removable-media
Snap sourcecode: https://github.com/nbuechner/gthumb-snap
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Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.