X2Go with MATE desktop used to work fine, I've been using it for years, but 
after upgrading to 22.04 a few months ago, it is broken and I don't know how to 
fix it.

If I try to connect with MATE (from Windows X2Go client), it shows a "New 
session started" popup, shows a blank window briefly, then closes.  On the 
server, running `dmesg --follow` at the same time, I see:

```
[14238.559864] show_signal_msg: 3 callbacks suppressed
[14238.559867] mate-session[129320]: segfault at 7f3200000060 ip 
00007f325d65f52f sp 00007fff9ee3b250 error 4 in 
libgdk-3.so.0.2404.29[7f325d623000+83000]
[14238.559876] Code: 57 82 fc ff 49 8b 9c 24 70 01 00 00 48 85 db 74 4e 49 89 
c5 eb 0a 0f 1f 44 00 00 48 85 db 74 3f 48 8b 2b 48 89 de 48 8b 5b 08 <48> 8b 45 
08 48 85 c0 74 e8 4c 39 e8 7f e3 49 8b bc 24 70 01 00 00
```

If I try to use something other than MATE, like "Connection to local desktop" 
(which also used to work), it shows "Select desktop" with `:0` and `:1` as 
options.  If I select either, and hit "View Only" or "Full Access", I just get 
a black window and nothing in `dmesg`.

Same results from another Windows computer that used to work, so it's a server 
issue, not a client issue.

https://askubuntu.com/q/1432163/5032
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