After trying so many ROMs that are available, sometimes I think, especially considering the latest releases from Google, that stock is the way to go. Flashing it using these images is my preferred method, being the cleanest, and I have provided these for your convenience as I haven’t seen them anywhere else only ever seen flashable ROMs (i.e. from Recovery) based on the factory images, etc...
Factory Images “yakju” for Galaxy Nexus “maguro” (GSM/HSPA+)
- Android 4.1.2 (JZO54K) with SU binary only
- Android 4.1.2 (JZO54K) with SU binary and SuperSU app
Download links are here. MD5 and SHA1 sums are listed so you can check the downloads.
You have to use Fastboot to flash these to your device. The only requirement is that your device's bootloader is unlocked, which you can easily do, but be warned that this will wipe your user data as will flashing these factory images.
To Unlock Bootloader (in the terminal):
fastboot oem unlock