ubuntu-gnome@ubuntu-gnome:~$ fdisk -l 
fdisk: cannot open /dev/ram0: Permission denied
fdisk: cannot open /dev/ram1: Permission denied
fdisk: cannot open /dev/ram2: Permission denied
fdisk: cannot open /dev/ram3: Permission denied
fdisk: cannot open /dev/ram4: Permission denied
fdisk: cannot open /dev/ram5: Permission denied
fdisk: cannot open /dev/ram6: Permission denied
fdisk: cannot open /dev/ram7: Permission denied
fdisk: cannot open /dev/ram8: Permission denied
fdisk: cannot open /dev/ram9: Permission denied
fdisk: cannot open /dev/ram10: Permission denied
fdisk: cannot open /dev/ram11: Permission denied
fdisk: cannot open /dev/ram12: Permission denied
fdisk: cannot open /dev/ram13: Permission denied
fdisk: cannot open /dev/ram14: Permission denied
fdisk: cannot open /dev/ram15: Permission denied
fdisk: cannot open /dev/loop0: Permission denied
fdisk: cannot open /dev/sda: Permission denied
fdisk: cannot open /dev/sdb: Permission denied
fdisk: cannot open /dev/mapper/luks-d3b1f642-fa3e-4532-8466-26fb2f9bd57c: Permission denied
fdisk: cannot open /dev/mapper/ubuntu--gnome--vg-root: Permission denied
fdisk: cannot open /dev/mapper/ubuntu--gnome--vg-swap_1: Permission denied