Whenever I try to Generate BSP or access the BSP editor on a NIOS II project (Quartus 20.1 on Debian 10 running in a QEMU VM on an Arch Linux host), it simply sits at the loading stage indefinitely. I have the NIOS II circuit flashed to my FPGA (which also proves that USB forwarding is working), yet it does not work as it should. See the attachment for the screen that it hangs on when Generate BSP is called. Note that the window remains resizable, etc. it just doesn't move on from this screen.
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Quick clarification, did you managed to open/create new bsp files in the BSP editor? And the hangs is after or before?
As for the screenshot of the error mention, is that happening within the BSP editor window?
Would suggest to try an alternative which is to generate the BSP via NIOS terminal command, just to check if there is anything potential issues with the project.
Try looking at this:
Carefully follow the instructions that the reply indicates, including running Eclipse from the command line with --clean option. This helped a lot on Linux.
Welcome to a world of pain you never thought possible with Altera and Eclipse.
Good day, unfortunately as we do not receive any response, we would assume that the problem are fixed.
Hence will be transitioning this to community support. If that is not the case please feel free to reopen this thread or open a new one and we would be with you.