I don't know if you have access to this from your repos, as old-stable seemingly is buster, so probably not there, though you also list sid, so dunno if you can get it through regular 'apt install', and otherwise as you cannot use libtorrent develop PPA on debian, then I guess your only bet is download the debian libtorrent deb packages and install, though you probably need several deps to go also, boost and whatnot, or lastly build yourself. I tested it worked through apt's regular python3-libtorrent package(libtorrent-rasterbar10), which was 1.2.9 on this ubuntu 20.10 VM I tested this in. Thanks for letting us know btw, from this, as pretty important info the awesome footleg job doadin making currently for providing a windows installer in feature, also uses this libtorrent from pypi also. Why deluge-console states otherwise i'm not sure, but regardless, this is the issue unfortuently, as otherwise pretty nice getting latest libtorrent from pypi, i'll see if I can report it to author if he has a github or something, as I know e.g.
#Deluge bittorrent error iso
I tested by loading a linux iso and adding manually a known working https tracker to it, and it states 'unspecified system error' just like yours.
![deluge bittorrent error deluge bittorrent error](https://cheapwindowsvps.com/blog/wp-content/uploads/2017/10/picture2.png)
This means that https trackers will never be announced to sadly.
![deluge bittorrent error deluge bittorrent error](https://howto88.com/wp-content/uploads/2022/02/1644089938_282_Linux에서-qbittorrent-및-Deluge를-다운로드-및-설치하는-방법.jpg)
So, in short, the libtorrent on pypi unfortunetly forgot, or decided against for whatever reason, to use crypto=openssl b2 building flag, which isn't default, or miss/wrongly-set the openssl-include option pointing to correct openssl lib path. Presumably libtorrent itself handles this for trackers through openssl, which then update-ca-certificates should work i'd guess, but regardless I had a slight hunch I wanted to check out first before letting you down a goose-chase, and it was correct actually, my speculation I mean.