Flatpak install/update fails with "Need more input" or "Input buffer too small"
discussion.fedoraproject.org
Problem When installing or updating flatpaks on Fedora 38, you might see an error like this one: Error: ... Writing content object: Need more input or this one: Error: ... Input buffer too small It might only happen for some flatpaks and not others (it seems to affect the larger ones), so your app might be just partially installed/updated. Cause There was a regression between flatpak and ostree, once ostree-2023.4-1.fc38 update was pushed into stable Fedora updates. Related Issues [Bug]: ...

Resolved: ostree 2023.4-2 (as linked in the comments below) has been pushed to stable, updating your system will resolve the issue.

Tl;dr: There seems to be a bug in ostree-libs 2023.4 that causes errors when trying to update flatpaks, gnome software loads forever when trying to update a flatpak and manually running flatpak update shows errors (I was getting an “input buffer too small” error, others seemed to be getting errors like “Need more input”.)

Running sudo dnf downgrade ostree worked perfectly for me, I’ll be ignoring the ostree/ostree-libs update for now and hopefully the issue will be resolved soon.