Comment 34 for bug 1791542

comment #21 worked for me.
https://bugs.launchpad.net/ubuntu/+source/libglvnd/+bug/1791542/comments/21

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had to add this line to `/etc/apt/sources.list`:

~~~
deb http://archive.ubuntu.com/ubuntu/ bionic-proposed restricted main multiverse universe
~~~

then

~~~bash
# apt update; cd /tmp/; apt download nvidia-340/bionic-proposed; dpkg -i nvidia-340_340.107-0ubuntu0.18.04.1_amd64.deb; apt-get install -f;
~~~