Thank you very much for your help.
Now my libtorrent version is 1.2.14 but why the libtorrent site says the last version is 2.0.4?
I can move my torrents now.

Thanks again

Thanks for your reply, but the 1st line gave me error 404! ERROR: ppa 'libtorrent.org/rc-1.2-daily' not found And the last line gave me this: sudo apt install python3-libtorrent Reading package lists... Done Building dependency tree... Done Reading state information... Done python3-libtorrent is alr...

Can you please teach me how to upgrade libtorrent?
Thanks,