Clean, polished version

Issue:
After recent EOL changes in Kubuntu 24.10, I downgraded to Kubuntu 24.04.3 LTS. I couldn’t upgrade to 25.10 because intrafms was not compatible with my host system.
During the downgrade, Ubuntu’s distro-upgrade process forced Opera to reinstall — but Opera would not launch afterward.

Error message:

User profile is locked by a session on another computer to prevent corruption

There were no clear instructions on how to unlock the profile, so here’s what worked for me:

Fix Steps

Logged into my old system and removed Opera snaps:

sudo snap remove opera

Logged into my Opera account using Brave browser

Went to Settings → Connected Devices / Sessions

Removed all active sessions (desktop & mobile just to be safe)

Rebooted into Kubuntu 24.04.3 LTS

Launched Opera Desktop

Opera launched successfully — it created 3 sessions automatically (not sure if that’s normal behavior?).

Note: Sync still failed initially, so I imported bookmarks manually.

Questions for the community

Is there a better way to handle Opera profiles when downgrading/major upgrading Linux?

Is Opera creating 3 sessions expected behavior after reset?

Any recommended backup/sync strategy for Opera before Linux distro changes?

Cache was already cleared before testing.

Thanks in advance for any advice — hope this helps others too.