Die repetitiven Fehlermeldungen lauten:
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Reading all physical volumes. This may take a while...
Found volume group "xxx-vg" using metadata type lvm2
WARNING: Failed to connect to lvmetad. Falling back to device scanning.
2 logical volume(s) in volume group "xxx-vg" now active
WARNING: Failed to connect to lvmetad. Falling back to device scanning.
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ALERT! /dev/disk/by-uuid/74477230-be91-414d-ab20-19ce702aa9ec does not exist.
Check cryptopts=source= bootarg: cat /proc/modules; ls /dev
or missing modules, devices: cat /proc/modules; ls /dev
-r Dropping to a shell. Will skip /dev/disk/by-uuid/74477230-be91-414d-ab20-19ce702aa9ec if you can't fix.
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BOOT_IMAGE=/vmlinuz-4.9.0-2-amd64 root=/dev/mapper/xxx--vg-root ro quiet
/etc/crypttab ist leer. Die wesentlichen Einträge in der /etc/fstab sind:
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/dev/mapper/xxx--vg-root / ext4 errors=remount-ro 0 1
UUID=972dc... /boot ext2 defaults 0 2