deleting partition

[jkchili]

Need to delete third installation.
I'm triple booting XP,Ubuntu, and Mint.Cannot get the glitches out of the Mint installation.
So, is there a way to delete Mint without losing the Ubuntu install.
I did delete it once and did the fixmbr for XP but could not boot the Ubuntu,
so reinstalled mint just to boot to ubuntu.
The reason
I'm asking is because it took too long to smooth out Ubuntu due to the old graphics card.
Don't want to go through it again. Thanks