I accidentally deleted everything in usr/bin (and possibly more) and trying to recover my Ubuntu.
First, I tried to chroot with a bootable USB but my USB was not recognized by Grub. I have just bought my ASUS zenbook and only had 2 files in my Ubuntu, so I decided to reinstall it.
So, I deleted the Ubuntu partition and inserted my bootable USB. Now, I see a new black page saying GNU Grub with minimal bash in white and cannot access Windows.
I checked my bootable USB on another machine, and it is perfectly working there. What should I do to reinstall Ubuntu?