First of all to make a backup for your personal data (if present, ignore this
that your situation doesn't have personal data) from your old MBR scheme. :)
sudo gdisk /dev/sda
o # Fresh GPT scheme
n # New partitions, with 1 GiB (+1G) of ESP, EFI sys partition,
# +16G of each ext4 to install Parabola and Trisquel for many times on
demand,
# plenties of +16G ext4 partitions are best
# Finally reserve for an +128G ext3 for your own personal data, compatible
with TrueOS and possibly other BSDs :)
p # Preview your partitions
s # Sort your partitions to get yourself ordered
w > y # Proceed with your new GPT scheme :)
You are here well done, you are now free to install Parabola and Trisquel. :D
8)
