Happened to me too!, but only on one of my machines. All running Manjaro Linux (Plasma version)
As I am on Linux, when I typed “mount”, I saw many stray mount points like “/tmp/.mount_KopiaUzHVwlt” etc.
Remove them and restart kopiaUI.
That fixed the issue for me on beta 4.
I’m now running current build from git.
I think there’s some required package missing, but not sure which one. We don’t test Kopia-UI on Linux regularly (because there’s so many distros of Linux which makes this impossble), so I’d appreciate if somebody from the community could help figure that out so we can document it.
BTW there could be more logs under $HOME/.cache/kopia/cli-logs/ and/or $HOME/.config/kopia-ui/
Deleting the config files for kopia and kopia-ui fixes this issue temporarily, but kopia-ui stops running after I connect to a repository and the config files are populated again. Moreover, when it does run, I get a “failed to load” error five times.