ubuntu@ubuntu:~$ sudo fixparts /dev/sda
FixParts 0.8.8

Loading MBR data from /dev/sda

NOTICE: GPT signatures detected on the disk, but no 0xEE protective partition!
The GPT signatures are probably left over from a previous partition table.
Do you want to delete them (if you answer 'Y', this will happen
immediately)? (Y/N): Y
Erasing GPT data!

Warning: 0xEE partition doesn't start on sector 1. This can cause problems
in some OSes.

MBR command (? for help): ?
a	toggle the active/boot flag
c	recompute all CHS values
l	set partition as logical
o	omit partition
p	print the MBR partition table
q	quit without saving changes
r	set partition as primary
s	sort MBR partitions
t	change partition type code
w	write the MBR partition table to disk and exit

MBR command (? for help):