Long story short, I modified the file /usr/share/gnome-shell/theme/Yaru/gnome-shell-theme, which was supposed to change the login screen wallpaper. But I don't know anything about CSS and now I can't boot Ubuntu anymore.
I made my laptop dual boot between Windows 10 and Ubuntu 20.04. So I'm expecting to fix that file from Windows. How can I get the root privilege and then access the ubuntu partition on Windows?
These were my attempts:
Ext2Fsd: It could see the content of all of my partitions, except the root and home. When I mounted them, the root and home partitions just appeared to be empty.
Ext2Explorer: It displayed no partition (even with run as admin)
Linux Reader: I mounted the root partition, and could actually go to the directory of the CSS file! But when I try to fix it (by first copy it to Windows, type it back to its original content, and then paste it back to its directory), it says: No such file or directory. I also tried to disable the read-only mount permission but there's always an error from nowhere that stopped the process.
DiskGenius: Same as Linux Reader: I could get to the CSS file location, copy & paste, but "No such file or directory" again.
Windows Subsystem for Linux: I went to
/dev,ls -land looked for sdb1 2 3 4, one of them was my root partition. But there're only a pile of tty files, no sdb. Also went to/mnt, which shown me 3 files C D E that were my Windows partitions. I used Ext2Fsd to mount my root as F, and went to/mnt/F. It's empty.
I guess those attempts failed because I don't have the permission to write on the root partition.
