root@ubuntu:/dev# sudo mount /dev/sda1 /mnt 
root@ubuntu:/dev# cd /mnt/sda1
bash: cd: /mnt/sda1: No such file or directory
root@ubuntu:/dev# cd /mnt
root@ubuntu:/mnt# ls
abi-3.13.0-32-generic         memtest86+.bin
abi-3.13.0-35-generic         memtest86+.elf
config-3.13.0-32-generic      memtest86+_multiboot.bin
config-3.13.0-35-generic      System.map-3.13.0-32-generic
grub                          System.map-3.13.0-35-generic
initrd.img-3.13.0-32-generic  vmlinuz-3.13.0-32-generic
initrd.img-3.13.0-35-generic  vmlinuz-3.13.0-35-generic
lost+found                    vmlinuz-3.13.0-35-generic.efi.signed
root@ubuntu:/mnt
root@ubuntu:/mnt# sudo mount /dev/sda1 /mnt/boot/efi 
mount: mount point /mnt/boot/efi does not exist
root@ubuntu:/mnt# mount -o bind /dev /mnt/dev 
mount: mount point /mnt/dev does not exist
root@ubuntu:/mnt# exit
exit
ubuntu@ubuntu:~$ sudo mount /dev/sda1 /mnt/boot 
mount: mount point /mnt/boot does not exist
ubuntu@ubuntu:~$