Every hour I get 2 notifications (sound) at 27' and 57' exactly. There is no app nor message in the status bar, just the sound.

It started a couple of days ago. I did not install any new software before that.

How to know which daemon or app does this ?


It was a mail account failing to retrieve emails. I had to delete the mail account and reconfigure it. There was an icon flashing at the time of sound but not staying in the status bar.

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  • It has been two days, so please mark this as answer (if it worked) – Dan Brown Aug 11 '16 at 20:09

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