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Can anyone help?

Running Qbittorrent on Ubuntu Server 20.04.1 LTS and I'm having issues with Qbittorrent's handling of the file names for use in Sonarr, which I have identified as a torrent/filename mismatch on Qbittorrent, for versions higher than 4.2.5, referenced from another forum.

I'd like to downgrade to 4.2.5, but the PPA doesn't have this to install. How would I revert to this version please?

Note. I have no desktop/gui. and am fairly inexperienced with using command line on Linux, but eager to learn!

Thanks in advance.

Could you give an example of the file name mismatch caused by 4.3.0.1?

I have no such problem myself. I use qbit with sonarr and radarr. I think it is mostly your settings problem not qbit