Like many others have suggested, you may want to try Bitwig. I understand that it’s the alternative DAW that is the most similar to Ableton. The company was started by a group of ex-Ableton employees, so it’s not a coincidence. Many people online feel that it’s in general a better DAW than Ableton, so you may end up liking it. It supports Linux natively, even provides an official flatpak (or Ubuntu installer?)
It’s not as expensive as some make it out to be, and it’s on sale right now for a few more days. I just yesterday bought Bitwig Studio Essentials. They have 3 editions and Studio Essentials is the starter version, currently $79 (reg. $99). The next level up is Studio Producer, currently $149 (reg. $199), and the top level is just Studio, currently $299 (reg. $399). They also offer rent to own for $16/month for 25 months on Splice.
I have had a similar experience. Most sites with Anubis take only a few seconds to go through, but I ran into I think it was some small blog where it took at least 5 minutes. Like someone mentioned, it may have been how they set it up with number of hashes required. The site that took forever for me seemed to have some exorbitant number like 5k or 50k (I don’t recall exactly).