After upgrading to recent versions of Endless OS 3, some users may find that their disk is full and they are unable to install any further updates. This problem will be addressed automatically in a future Endless OS update.
If you are already in this situation and cannot upgrade, try following these steps:
sudo ostree refs --delete eos:eos2/i386 local:factory and press Enter. sudo ostree prune --refs-only and press Enter.If the first command shows an error such as "No such metadata object", try running sudo eos-fix-ostree-repo. This command will take a long time. Wait for it to output: “Success! Try to update the OS and Apps now”. Then try following the steps above again.
If, after following these steps, there is still not enough space to install the OS update, try following these instructions.