[Bug 2114156] Re: crypttab breaks display controls

Paul Taylor 2114156 at bugs.launchpad.net
Thu Jun 12 13:01:13 UTC 2025


Title should have said cryptsetup.

The relevant lines of my /etc/crypttab and /etc/fstab are:

encrypted /dev/nvme0n1p2 none luks

/dev/mapper/encrypted /paul ext4  defaults 0 2

It appears that systemd can handle encryption without cryptsetup, so
please explain how to do that with a pre-existing encrypted partition.

The way I like to partitiin my computer disks is:

Two or three "system" (/) partitions, so that I can do a clean LTS re-
installation whilst leaving the old one intact.  These include /home/pt
because so many programs dump stuff there nowadays - it's no longer "my"
home directory.

Plus an encrypted partition called /paul that contains my own stuff,
organised in my own way, with lots of symbolic links into it from
/home/pt .

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https://bugs.launchpad.net/bugs/2114156

Title:
  crypttab breaks display controls

Status in cryptsetup package in Ubuntu:
  New

Bug description:
  Following a clean installation of XUbuntu 24-04 (updated) and then
  "apt update" and "apt upgrade"

  I did "apt install cryptsetup" and hand editted /etc/crypttab and
  /etc/fstab to point to a pre-existing encrypted partition that had
  been created using the same methods.  Then I re-booted.

  During boot, there is a brown text box, but it seems the keyboard is
  not recognised.

  So instead I use the recovery mode on both screens ("advanced options"
  and "recovery mode") and type the password amongst the boot log text.
  Then login proceeds correctly, with the encrypted partition mounted
  and readable.

  But in addition to this, the Fn-F8/F9 keys, which without cryptsetup
  controlled the screen brightness, no longer do that.

  Moreover, in Settings/Display, the laptop screen, which had been
  called "laptop" without cryptsetup, is now called "None".

  Also, an external LCD monitor connected by an HDMI cable, which had
  been recognised without cryptsetup, is no longer recognised.

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