Ok. We can at least disable the repositories which should allow the update/upgrade to ignore the Brave entries and run.
Click 'Menu'
Begin typing 'Software & Updates' into the search box
When 'Software & Updates' appears on the list, click on it.
Select the 'Other Software' tab in the box that opens
Untick any entries for Brave.
Enter your password if asked.
Click 'Close' on the lower right of the 'Software & Updates' window
Click 'Reload' to update the cache
Retry your update/upgrade.
Click 'Menu'
Begin typing 'Software & Updates' into the search box
When 'Software & Updates' appears on the list, click on it.
Select the 'Other Software' tab in the box that opens
Untick any entries for Brave.
Enter your password if asked.
Click 'Close' on the lower right of the 'Software & Updates' window
Click 'Reload' to update the cache
Retry your update/upgrade.
stevef
clueless
clueless