> I'm sorry, would you mind elaborating? profiles.ini allows
configuration of where each profile stores emails, so what are the
consequences of my doing that? I used it, and the same PATH variable,
prior to 24.04 without problem.

that will direct thunderbird to access your emails stored at the location 
  /media/lubuntu/drive/hq/email/thunderbird/certainprofilegoeshere

which explains why your dmesg contains denials like
  [39889.472715] audit: type=1400 audit(1714429239.953:352): apparmor="DENIED" 
operation="open" class="file" profile="snap.thunderbird.thunderbird" 
name="/media/lubuntu/drive/hq/email/thunderbird/awesomenough/.parentlock" 
pid=72158 comm="thunderbird-bin" requested_mask="wc" denied_mask="wc" 
fsuid=1000 ouid=1000

which was my comment about being at a loss as to why thunderbird is
trying to access

```
/media/lubuntu/drive/hq/email/thunderbird/awesomenough/.parentlock
/media/lubuntu/drive/hq/email/thunderbird/awesomenough/lock
```


The consequences of doing that are that the snap confinement for thunderbird 
doesn't give it access to that location. The thunderbird deb is installing the 
thunderbird snap, you can read more about it at the following link 
https://www.omgubuntu.co.uk/2024/02/thunderbird-snap-in-ubuntu-24-04

For the chrome snap I would have to see the dmesg output to be sure but
it could be a similar issue.

So how to address this. Unfortunately doesn't currently have a mechanism
to allow the user to override its confinement. You can manually update
the generated apparmor profile but snap will regenerate it and throw
your custom rules away the next time it refreshes the application.

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https://bugs.launchpad.net/bugs/2064363

Title:
  thunderbird snap on live systems "already running" but not responsive

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