Error message Purism repos

I checked which repos I have installed on my Purism laptop. These have not changed in over 6 months. Now when I update my system via CL I get the failed to fetch message. I have attached a screen shot. Any ideas. Thanks all.

@Zigmeister There is one error in that sources list.

You have the sources for both the Stable and testing versions of PureOS: Amber (stable), and Bizantium (testing).

You will need to remove one of the sources.

Which version do you wanted to have, Stable or Rolling (testing).

Also can you paste here the output of:

cat /etc/lsb-release

Thank you for your help! here is the output you requested:

jwz@Ziggy:~$ cat /etc/lsb-release

I would prefer to keep the Byzantium/testing version. Just so I don’t mess it up what command should I type in to remove Amber? Again, I am still unsure as to what happened with my updates. I have been updating my computer without any problems until yesterday. Thanks again.

I would assume I would use the command sudo add-apt-repository -r to remove amber.

you can use nano and comment out the amber sources from /etc/apt/sources.list and then run a sudo apt update, and sudo apt full-upgrade