[Bug 1568560] Re: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed

[axel]

There is a fix for this:
https://ubuntuforums.org/showthread.php?t=2305819

add a file to the /etc/modules-load.d directory to have the modules
loaded into the kernel at boot.  I just created a file called
netfilter.conf and put the following in it:

nf_nat_pptp
nf_conntrack_pptp
nf_conntrack_proto_gre


Is it safe to use this solution? I don't know what those three entries mean.

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https://bugs.launchpad.net/bugs/1568560

Title:
  nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed

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