https://bugs.kde.org/show_bug.cgi?id=412779

            Bug ID: 412779
           Summary: Test for and try to fix a lack of FUSE availability
           Product: Plasma Vault
           Version: unspecified
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: critical
          Priority: NOR
         Component: general
          Assignee: ivan.cu...@kde.org
          Reporter: n...@kde.org
  Target Milestone: ---

Manjaro with all KDE software built from source.

I recently lost the ability to access my vault using the Vaults GUI. Trying to
mount the vault resulted in Dolphin opening with the path to the mountpoint,
but the vault was not mounted on top of it; the mountpoint was just an empty
folder. No error was printed in the GUI.

plasmavaultrc contained a bit more information: 

lastError=Configured backend does not exist: (code: 2)
lastStatus=255

Still not very helpful. So I tried to mount it manually, without using
plasma-vault:



Password: 
Deriving encryption key (this can take some time)...done

Mounting filesystem. To unmount, call:
$ cryfs-unmount "/home/nate/Vaults/XXXXXXXXXXXXX/"

fuse: device not found, try 'modprobe fuse' first



Sure enough, running `sudo modprobe fuse` fixed the problem and now I can mount
it using the CLI or the plasma-vault GUI again.

The software should detect this condition and try to fix it automatically, or
else present the full error log to the user so they can try to fix it or at
least google it. Otherwise the user is left with the impression that their
private data has been lost. Personally speaking, this vault contains my
budgetary and financial data and all my passwords. If I was a regular user with
no knowledge of how the system worked and how to fix it, I would have been left
with feelings of panic and rage and the desire to never again entrust my data
to open-source software.

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