Hello community, I hope someone can help me with my problem.

I login to a Ubuntu machine running 18.04.3 kernel GNU/Linux 4.15.0-58-generic 
x86_64 using "ssh -X -o ServerAliveInterval=60".  When I start Firefox I get 
the following:

libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
[Parent 30374, Gecko_IOThread] WARNING: pipe error: Broken pipe: file 
/build/firefox-qCOyDf/firefox-68.0.2+build1/ipc/chromium/src/chrome/common/ipc_channel_posix.cc
 
<https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fipc_channel_posix.cc&data=02%7C01%7CRandy.Burrow%40unt.edu%7Ce4e4d1e113854ec2eb0408d724e23fd5%7C70de199207c6480fa318a1afcba03983%7C0%7C0%7C637018426478802054&sdata=zho0PfHUfFduRt2xtjBxPjEcxy5zVOo6HV5iSaD%2Bdh4%3D&reserved=0>,
 line 727

Firefox continues to work for awhile or I quit and restart it or I start 
another X11 application then I get this:

Unable to init server: Broadway display type not supported: localhost:10.0
Error: cannot open display: localhost:10.0

I can logout and then log back in and Firefox and other X11 applications will 
work again for awhile.


I verified there is a libgl installed and is the most recent.  The hardware is 
a Dell 7425 with Dual 16-core APYC processors, 128 GB memory and the software 
was installed last week.  Our sysadmin logged into the machine with X 
forwarding from his Ubuntu workstation and did not have any issues with firefox 
or other X applications at all.  This makes it seem that it is something Mac 
related.

Should I be looking for a different libgl library?  Could there be a Mac X11 
configuration item that I could look at?  I am running MacOS 10.14.6 on an iMac 
Pro that is 8 months old.  I downloaded the X11 package last week with XQuartz 
indicating version 2.7.11

Any suggestions will be greatly appreciated.  I can continue to logout and 
login, but doing that every 15-20 minutes sorta disrupts the work flow.

THANKS!

Charles




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