Public bug reported:

Since Ubuntu 18.04 LTS, a minimal installation is possible with the
Ubuntu installer. If I go for that and choose to encrypt the disk, I
cannot change the password via the utility gnome-disks graphically
afterwards.

Steps to Reproduce
1. install Ubuntu 18.04 LTS (daily 20180420 and Beta 2 tested)
2. encrypt the disk, while going through the installer
3. after installation: Disks (3.28.1) » (highlight) Partition 3 with LUKS (open 
padlock icon) » (button with two cog-wheels) Options » Change Passphrase » …

Expected Results
The password should be changed. Or if a software package is missing for this, 
it should install that. At least, a note should appear how to install/add that 
package.

Actual Results
“Error changing passphrase on device /dev/sda3: The function 
'bd_crypto_luks_change_key_blob' called, but not implemented! 
(udisks-error-quark, 0)”

Workaround
sudo apt install libblockdev-crypto2
After that, a log-off was not sufficient; instead I had to restart the 
computer. Before I found that, I was able to change the password 
non-graphically thanks to <https://superuser.com/a/431832>.

** Affects: gnome-disk-utility (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1765701

Title:
  [min. installation] Cannot change Passphrase.

Status in gnome-disk-utility package in Ubuntu:
  New

Bug description:
  Since Ubuntu 18.04 LTS, a minimal installation is possible with the
  Ubuntu installer. If I go for that and choose to encrypt the disk, I
  cannot change the password via the utility gnome-disks graphically
  afterwards.

  Steps to Reproduce
  1. install Ubuntu 18.04 LTS (daily 20180420 and Beta 2 tested)
  2. encrypt the disk, while going through the installer
  3. after installation: Disks (3.28.1) » (highlight) Partition 3 with LUKS 
(open padlock icon) » (button with two cog-wheels) Options » Change Passphrase 
» …

  Expected Results
  The password should be changed. Or if a software package is missing for this, 
it should install that. At least, a note should appear how to install/add that 
package.

  Actual Results
  “Error changing passphrase on device /dev/sda3: The function 
'bd_crypto_luks_change_key_blob' called, but not implemented! 
(udisks-error-quark, 0)”

  Workaround
  sudo apt install libblockdev-crypto2
  After that, a log-off was not sufficient; instead I had to restart the 
computer. Before I found that, I was able to change the password 
non-graphically thanks to <https://superuser.com/a/431832>.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-disk-utility/+bug/1765701/+subscriptions

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