Debian/Etch fails to upgrade x11-common ??

When I was trying to upgrade my etch to lenny, x11-common failed to upgrade properly. I was getting the following error message:

Error::
trying to overwrite `/usr/X11R6/bin', which is also in package aaa-base

For somebody who is really as annoyed (to hell) as me, this fixed the (!@#!$%$) problem for me:

Solution::
dpkg -i --force-overwrite /var/cache/apt/archives/x11-common_1%3a7.3+18_all.deb

X hangs on Ubuntu (gutsy) with latest Ati-fglrx driver

Symptoms:

• X takes 100% cpu after a certain period of inactivity
• mouse cursor moves, but doesn't respond to any clicks
• ctrl+alt+shift+F1 occassionally works (not always)
  

I started having this problem after installing the latest ati-fglrx driver.
My fglrx output:

OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI MOBILITY RADEON X300
OpenGL version string: 2.1.7412 Release

Browsed a thousands of forum entries, tried a zillion of solutions. Finally this is what seemed to have fixed the problem for me:

vim /etc/default/acpi-support

# Should we save and restore state using the VESA BIOS Extensions?
SAVE_VBE_STATE=false

# Should we attempt to warm-boot the video hardware on resume?
POST_VIDEO=false

also check http://babilonline.blogspot.com/2008/03/unbuntu-ati-proprietary-fglrx-driver.html

X forwarding over SSH

sshd_config::

X11Forwarding yes
AllowTcpForwarding yes

ssh_config::

ForwardX11 yes or
ForwardX11Trusted yes