У меня проблемы с торрентами в Ubuntu 20.04

Same here, after I updated to Ubuntu 20.04 Transmission stucks at medatadata. I installed qBittorrent and it is working for me. I know you said you tried it already; but this is how I did it, it might help someone:

How to install qBittorrent:

$> sudo add-apt-repository ppa:qbittorrent-team/qbittorrent-stable

$> sudo apt-get update

$ sudo sudo apt install qbittorrent

У меня есть та же проблема. Я использую VPN и в приложении не настроен прокси. Единственный способ запустить торренты - это остановить торрент, изменить порт в настройках и снова запустить торрент. Я все еще ищу решение этой проблемы. Кажется, существует известная проблема с использованием прокси, но в моем случае это не имеет значения.

Two things you can check here that I came across while configuring qbittorent on Ubuntu 20.04.

Is UFW enabled? You can check with sudo ufw status verbose If so, you can quickly test if this is preventing progress by temporarily disabling: sudo ufw disable If it works after this, check the docs for your particular application and see what firewall rules need added. Don't forget to re-enable after validating this isn't the issue, or getting the proper rules in place.

Does the application account have permission for the directory it's saving the file to? Say you are saving to /mnt/data/torrents. The user account the torrent software is running as needs to be able to read and write there. In my case, I make the qbittorent user the owner of the download directory. Using the example directory above, you can change the owner/group with sudo chown user_in_question:user_in_question /mnt/data/torrents

Otherwise, the problem lies in your network config. If this is simply a home server/workstation then there is no need for a proxy to be configured unless you are attempting to circumvent geographical limitations. If you are not on a home network, but a corporate one or public one then there is a good chance that p2p file-sharing is blocked somewhere upstream.