Hi 

I followed exactly the instructions on 
https://wiki.trinitydesktop.org/Ubuntu_Trinity_Repository_Installation_Instructions

And I obtained 

Skipping acquire of configured file 'main/binary-i386/Packages' as
repository 'http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-r14.0.x
focal InRelease' doesn't support architecture 'i386'
N: Skipping acquire of configured file 'main/binary-i386/Packages' as
repository '
http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-builddeps-r14.0.x
focal InRelease' doesn't support architecture 'i386'

E: Failed to fetch
http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-r14.0.x/pool/main/t/tdenetwork-trinity/krfb-trinity_14.0.8-0ubuntu20.04.0+0_amd64.deb
 Error reading from server. Remote end closed connection [IP: 37.205.10.16
80]
E: Unable to fetch some archives, maybe run apt-get update or try with
--fix-missing?

So I run fix-missing and it seems to have succeeded, but I found the
whole process a bit suspicious.

Any comments?

Regards 

Uwe Brauer