When launching Cider v2.5.0 on Ubuntu 24.04 (just upgraded from 22.04), Cider never opens. Launching via CLI gives this output:

```
cider --trace-warnings

[24090:0917/112237.227066:FATAL:credentials.cc(127)] Check failed: . : Permission denied (13)

[1]    24090 trace trap (core dumped)  cider --trace-warnings
```

same error for me, they started appearing after the upgrade from 22. I removed cider, reinstalled the latest version from this page and the terminal showed me the same thing

[10990:0929/173546.613213:FATAL:credentials.cc(127)] Check failed: . : Permission denied (13)

Trace/breakpoint trap (core dumped)

Ok, the fix for this (or what worked for me) is apparently this:

sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0 

as per these questions.
- https://stackoverflow.com/questions/76165512/fatalcredentials-cc127-check-failed...

- https://askubuntu.com/questions/1471028/fatalcredentials-cc127