Public bug reported:

Binary package hint: ubiquity

Using: Kubuntu Feisty Herd 2 i386 Desktop (same thing happened with Herd
1)

Using normal boot of the CD (i.e. no special graphics configuration in
the boot loader, just configuring German language and keyboard layout).

At several points in the installer that are related to partitions,
scanning partitions and formatting partitions, it appears as if the X
server gets confused: Sometimes, a black horizontal bar appears in the
bottom third of the screen. At other times, the display gets completely
disabled.

Reliably workaround: Switch to another virtual terminal and back to the
X session (e.g. Ctrl+Alt+F1, then Alt+F7). This recovers the X session
completely.

I really don't know which component is the culprit - whether it's the
installer, the X server, or something else. For good measure, I'm going
to attach a number of logfiles and lspci output.

If you have an idea how I can help figure this out, please tell me!

FWIW, the rough hardware setup is:
- Athlon XP 2400+
- 1GB RAM
- ATI Radeon X800 Pro, 256 MB memory

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
Installer / partitioning messes up X display
https://launchpad.net/bugs/79269

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