Caja mounting & unlocking LUKS encrypted USB stick fails

[Dan]

Distro: 18.04 (beta 1, dev branch)
Kernel: 4.15.0-12-generic

When attempting to unlock and mount a LUKS encrypted USB stick with Caja (using the dialogue that pops up when an encrypted stick is plugged in), the process fails with the following error:

"Unable to mount 63 GB Encrypted. Error unlocking /dev/sdb1: The function 'bd_crypto_luks_open_blob' called, but not implemented!"

Update: As described below, the issue is not confined to Caja, but is also evident when using other GUI applications to unlock LUKS encrypted volumes.

[Chris McDonough (chrism-plope)]

Same error when attempting to unlock a LUKS-encrypted HDD partition using the Disks application.

This began to happen, AFAICT, after a kernel update to 4.15.0-10-generic.

cryptsetup luksOpen /path/to/device devicename works ok so it appears to be related to whatever libraries bridge stuff between the GUIs and the kernel.

[Chris McDonough (chrism-plope)]

(note for #1 : I did not start with beta1, this was an install that used a daily build from about 2 weeks ago)

[Chris McDonough (chrism-plope)]

After some poking around via Google, I worked around it with some help from https://www.distrowatch.com/weekly.php?issue=20171113 .

The solution is to apt-get install libblockdev-crypto2 then reboot.

[Dan (aninstanceofi)]

Thanks Chris. I've updated the description to better reflect the bug (i.e. not specific to Caja).

[Jean (easthighnerd)]

Experiencing this as well, also running UM 18.04 B1, but on the 4.15.0-12-generic kernel.

Chris' workaround worked for getting things working again.

[Martin Wimpress  (flexiondotorg)]

libblockdev-crypto2 is installed by default in Ubuntu MATE 18.04.1