Might seem like a small thing but I am not at all a fan of the greeter screen that I get in Big Sur when switching users. It is the Big Sur Graphic.heic that is shown and I don't like it. Someone over at IM helped me a bit but I've hit a wall. I guess this could be considered off topic, and as this is
@pastrychef 's thread, if you want me to start a new one, let me know
The login wallpaper is at System/Library/Desktop\ Pictures which of course is read only now
So I boot into recovery
1. "diskutil mount /dev/diskXsY" where XY is my Big Sur read only volume
2. "mount -uw /Volumes/macOS\ Big\ Sur" (I'm told this makes the volume read write)
3. "cd /Volumes/macOS\ Big\ Sur/System/Library/Desktop\ Pictures"
4. now if I type "ls" I can see all the wallpaper file names
5. This is where I get stuck, I have been told I need to "create a symlink to another graphic" so I type "ln -s Volumes/macOS\ Big\ Sur/System/Library/Desktop\ Pictures/Big\ Sur.heic Volumes/macOS\ Big\ Sur/System/Library/Desktop\ Pictures/Big\ Sur\ Graphic.heic"
The message I get is "ln Volumes/macOS Big Sur/System/Library/Desktop Pictures/Big Sur Graphic.heic: No such file or directory
Any terminal gurus help me?