The problem was exactly from the gsconnect. After removing it, I have no
freeze any more. Thanks.
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https://bugs.launchpad.net/bugs/2055281
Title:
Desktop freeze w
Public bug reported:
When I open the Dash menu and proceed to navigate through the software
icons, after three or four transitions to the next page, the system
freezes completely, rendering the keyboard unresponsive. While any
ongoing music or video playback continues, I find myself unable to
inte