I can confirm what Sebastien proposed. Installing libblockdev-crypto2 and
restarting the udisks2.service did the trick.
Also it maybe worth mention that in my case the installation of Ubuntu
18.04(beta2) performed with the new "minimal installation" option.
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You received this bug notificatio
This also affects the case when you want to Open an encrypted disk/usb that was
LUKS encrypted on another Linux system (Debian/Ubuntu).
It cannot Open it - Mount it, returning a similar error.
The function 'bd_crypto_luks_open_blob' called, but not implemented!
(udisks-error-quark,0)
This only
