Dell Precision M3800 / DisplayLink D3100 - displaylink.service failed because ...

[CUnknown]

It looks like I'm having the same issue after a complete reinstall of Ubuntu 16.04 to enable full disk encryption and secure boot.

Previously, it was working fine (also Ubuntu 16.04 x64).

In the syslog it shows the error message: modprobe[11418]: modprobe: ERROR: could not insert 'evdi': Required key not available

[Bacms]

Originally Posted by CUnknown

It looks like I'm having the same issue after a complete reinstall of Ubuntu 16.04 to enable full disk encryption and secure boot.

Previously, it was working fine (also Ubuntu 16.04 x64).

In the syslog it shows the error message: modprobe[11418]: modprobe: ERROR: could not insert 'evdi': Required key not available

You probably need to re-sign your new kernel. This happens to me every time ubuntu updates it's kernel. Simply type:

sudo /usr/src/linux-headers-4.4.0-31-generic/scripts/sign-file sha256 ./EVDI.priv ./EVDI.der $(modinfo -n evdi)

Replacing the version of the headers by your own version