[Bug 1770758] [NEW] "No key available with this passphrase" after upgrade to 18.04

[AM]

Public bug reported:

XXX at XXX-laptop:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04 LTS
Release:        18.04
Codename:       bionic
XXX at XXX-laptop:~$ uname -a
Linux XXX-laptop 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
XXX at XXX-laptop:~$ apt-cache policy cryptsetup
cryptsetup:
  Installé : 2:2.0.2-1ubuntu1
  Candidat : 2:2.0.2-1ubuntu1
 Table de version :
 *** 2:2.0.2-1ubuntu1 500
        500 http://fr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status
XXX at XXX-laptop:~$ sudo su
root at XXX-laptop:/home/XXX# echo -n 'My_Passphrase' | cryptsetup luksAddKey /dev/sda3
Aucune clé disponible avec cette phrase secrète.
root at XXX-laptop:/home/XXX# echo -n 'My_Qwerty_Weirdish_Passphrase' | cryptsetup luksAddKey /dev/sda3
Aucune clé disponible avec cette phrase secrète.

Since upgrade from kubuntu 17.10 to kubuntu 18.04, I had the problem
described in this post :

https://askubuntu.com/questions/1031302/ubuntu-with-full-disk-
encryption-bad-password-after-upgrade-to-18-04

My successful workaround was to type my passphrase as if I had set it up
from an azerty physical keyboard with a qwerty software layout. No big
deal (and, I think, not the same bug ?), although I wanted to luksAddKey
my true passphrase so I could avoid the bother.

However, when I gave the passphrase(s) to the prompt (as shown above),
cryptsetup wouldn't recognize any of them, either the true one (azerty
physical and software layout) or the weird one (azerty physical layout /
qwerty software layout).

** Affects: cryptsetup (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1770758

Title:
  "No key available with this passphrase" after upgrade to 18.04

Status in cryptsetup package in Ubuntu:
  New

Bug description:
  XXX at XXX-laptop:~$ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 18.04 LTS
  Release:        18.04
  Codename:       bionic
  XXX at XXX-laptop:~$ uname -a
  Linux XXX-laptop 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  XXX at XXX-laptop:~$ apt-cache policy cryptsetup
  cryptsetup:
    Installé : 2:2.0.2-1ubuntu1
    Candidat : 2:2.0.2-1ubuntu1
   Table de version :
   *** 2:2.0.2-1ubuntu1 500
          500 http://fr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status
  XXX at XXX-laptop:~$ sudo su
  root at XXX-laptop:/home/XXX# echo -n 'My_Passphrase' | cryptsetup luksAddKey /dev/sda3
  Aucune clé disponible avec cette phrase secrète.
  root at XXX-laptop:/home/XXX# echo -n 'My_Qwerty_Weirdish_Passphrase' | cryptsetup luksAddKey /dev/sda3
  Aucune clé disponible avec cette phrase secrète.

  Since upgrade from kubuntu 17.10 to kubuntu 18.04, I had the problem
  described in this post :

  https://askubuntu.com/questions/1031302/ubuntu-with-full-disk-
  encryption-bad-password-after-upgrade-to-18-04

  My successful workaround was to type my passphrase as if I had set it
  up from an azerty physical keyboard with a qwerty software layout. No
  big deal (and, I think, not the same bug ?), although I wanted to
  luksAddKey my true passphrase so I could avoid the bother.

  However, when I gave the passphrase(s) to the prompt (as shown above),
  cryptsetup wouldn't recognize any of them, either the true one (azerty
  physical and software layout) or the weird one (azerty physical layout
  / qwerty software layout).

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