Comment 12 for bug 1921325

I see two problems

#1
The new PPA is 4529 which seems to work in your output.
But you still have the old (deleted) one configured as well.
You'll probably want to clear that old one out:
$ sudo rm /etc/apt/sources.list.d/ci-train-ppa-service-4503-bionic.list
$ sudo apt update
(I have guessed the filenme, but it will be that or very similar)

#2 it seems your system is very much "out of time"
" is not valid yet (invalid for another 13d 22h 14min 55s)."
You'd have to have a valid system time for most things to work (cryptography, updates, ...)
I'm not sure but could it be so easy as "set your time right"?
Please check
$ date
if it is anywhere close to real time