Accidently renamed the ld-linux-aarch64.so.1

On my Ubuntu command line system, I accidentally renamed the /lib/ld-linux-aarch64.so.1 file. This led to behavior that I cannot use any bash/dash/sh commands and cannot use mv any more to revert the file name. There are not many commands that I can execute and passing /bin/bash or /bin/dash as command is also not working and keeps saying: -bash: /bin/dash: No such file or directory, -bash: /bin/ls: No such file or directory.

Is there any way to get out of this state and recover?

This is done on 20.04.2 LTS (Focal Fossa). On the grub menu, you press 'c' to bring up a grub> prompt.

grub> linux /boot/vmlinuz
grub> initrd /boot/initrd.img
grub> boot

This will boot into an initramfs (busybox) shell:

(initramfs) mkdir /mnt
(initramfs) mount /dev/sda1 /mnt
(initramfs) cd /mnt/lib/x86_64-linux-gnu
(initramfs) ls ld-*
ld-renamed.so*
(initramfs) # Your ld.so version may differ
(initramfs) # (bionic 18.04 is ld-2.27.so)
(initramfs) cp -i -a ld-renamed.so ld-2.31.so
(initramfs) ln -s ld-2.31.so ld-linux-x86-64.so.2
(initramfs) ls -F ld-*
ld-linux-x86-64.so.2@  ld-2.31.so*