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I'm using ubuntu 14.04, and yesterday, I made a complete backup of my system using Deja-Dup, backing up everything on /.

When I attempted to restore the backup, Ubuntu froze while Deja-Dup was restoring the file /lib/modules/3.19.0-25-generic/updates/dkms/nvidia_352.ko.

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Then I made a new backup, excluding /lib/modules directory, and tried to restore this new backup. Same thing happened, but while restoring a different file, this time it was /lib/firmware/ti-connectivity/wl128x-fw-5-sr.bin.

enter image description here

Need your help with identifying what causes this behavior, and how to avoid it. Also, I want to know which directories (beside /home) should be backed up, and whether /lib is one of them.

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You're trying to restore system files to their original location meaning that they may overwrite files that are currently in use by the kernel. Don't do that! Either

  • restore your files to a different location than the root directory (/),

  • restore them from a different system (e. g. a live DVD/USB) onto the root file system of the target drive, or

  • restore only the files from the back-up that you need.

  • As you're a reputation 1 user: if this answers your question, don't forget to click the grey ☑ under the "0" at the left of this text to accept it, which means "yes, this answer is valid"! – David Foerster Jul 6 '16 at 19:02

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