I have a laptop with the top left corner's screen being broken - I can't see anything there. However it's just a small corner, so I'd like to know if there's something I can do to make Ubuntu not use that part of the screen at all - I basically want it to ignore 2 unity taskbars on the left, and re-position all the content.
Create a script @ let's say
make it executable
edit the file (I will use gedit here, so it is easier to paste for newbies)
paste the contents of this script:
Edit the first four lines to your required resolution. I have experimented with 1280x800 as my original one and I took a 120 pixels of the horizontal part as the unity bar is about 60 pixels wide.
Fallow these guidelines - How do I start applications automatically on login - to create a startup script.
Restart Ubuntu and hopefully you will get what you want. It works on my machine :)
Unfortunately the top left corner of the screen is very important for Unity and Mark Shuttleworth himself has said that there are no intentions of moving the launcher around.
You can try to tweak Unity a bit so that you can still work without the top-left corner.
Have a look at cairo dock for example. Install it like so:
Cairo dock is the launcher application that lays on the bottom of the screen. Once installed search in your apps
To run cairo dock at each reboot put it in your Startup Applications.
Run the tweak tools and under the Unity / Launcher section set
Anyway I would suggest you to install a more customizable window manager. A safe bet is Gnome Shell, but in your situation I'd go Cinnamon that doesn't use the top left corner much.
There are plenty of guides on askubuntu on how to install both of them. Once installed log out and from the login manager pick your new session (eg: Cinnamon) by clicking on the round Ubuntu logo.