Ubuntu 24.04: Simplenote 2.22.2 doesn't start

[thomas-maeder]

I have successfully installed Simplenote-linux-2.22.2-amd64.deb using dpkg.

Expected

• If I type simplenote in a command prompt, I'd expect the program to start.
• If I type man simplenote, I'd expect the man page to be displayed
• If I type simplenote --help, I'd expect a usage information to be displyed.

Observed

• If I type simplenote or simplenote --help, I get:
  [1656152:0110/093715.959918:FATAL:credentials.cc(127)] Check failed: . : Permission denied (13)
  Trace/breakpoint trap (core dumped)

• If I type man simplenote, I get: No manual entry for simplenote

Where did you see the bug

• System Make:
• System Model:
• OS: Ubuntu
• OS version: 24.04
• Browser (if applicable):
• Browser version (if applicable):
• Simplenote app version: 2.22.2

[thomas-maeder]

Might be a problem with apparmor. When I try to start simplenote, I see in dmesg:

kern :notice: [Fri Jan 10 14:03:49] audit: type=1400 audit(1736514229.228:937): apparmor="DENIED" operation="userns_create" class="namespace" info="User namespace creation restricted" error=-13 profile="unconfined" pid=1722862 comm="simplenote" requested="userns_create" denied="userns_create"
kern :info : [Fri Jan 10 14:03:49] traps: simplenote[1722862] trap int3 ip:567bf2e07e9a sp:7fff61e6c130 error:0 in simplenote[567bef170000+837d000]

[thomas-maeder]

It was apparmor indeed.

Once I added the following file, simplenote started starting:

$ cat /etc/apparmor.d/opt.Simplenote.simplenote
# This profile allows everything and only exists to give the
# application a name instead of having the label "unconfined"

abi <abi/4.0>,
include <tunables/global>

profile simplenote /opt/Simplenote/simplenote flags=(unconfined) {
userns,

# Site-specific additions and overrides. See local/README for details.
include if exists <local/simplenote>
}