How to open the terminal? (Mis-configured the profile)

Solution 1:

Sounds like you've botched your profile up slightly by adding a custom command (something that runs as soon as it opens).

Thankfully you can edit your profile settings by running this (use Alt+F2):

gconf-editor /apps/gnome-terminal/profiles/Default

If you've botched up too much you can use the Etch-a-Sketch method and reset everything back to defaults:

gconftool --recursive-unset /apps/gnome-terminal/

Solution 2:

The command

gnome-terminal -e bash

will work around the profile command setting.

Once started, you can modify the profile.