I’ve had this happen quite a few times to me using the Chromium browser in Ubuntu. Fixing it is easy — once you know how.

I found out how after I stumbled upon this thread.

All it involves is:

1. Using the chown command to reclaim ownership (to yourself from root) of the file /home/user/.config/chromium/Local State.

2. Doing the same with the file /home/user/.config/chromium/Default/Preferences.

Then reboot and everything should be fine. It was for me. Details in the link.

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