Horizon Client 8.5 crashing on Linux

Background

After upgrading from version 8.4 the Horizon Client was unable launch correctly. Launching it from the command line showed a segmentation fault:

I'm using Ubuntu 20.04 LTS, but other related distros may also be affected.

Solution

It turned out that Reddit user Zixyar had already found that you could solve this problem by editing the file /etc/pam.d/lightdm and uncommenting the line:

#session required pam_loginuid.so

After rebooting I was able to use the Horizon client 8.5 (2203-8.5.0-19586897) without problems.