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Download Opera browser with:
Seems to be caused by SEOQuake AddOn.
@asker77 Not sure how often Opera syncs.
@asker77 and everyone else: You have to enable the canonical partners repository in order to install adobe-flashplugin. You can do everything with these three commands:
Then restart Opera.
The first command adds the repository. You can also do that graphically by following these instructions, but the command is easier (cred to Ruarí Ødegaard).