Yesterday, I installed Ubuntu LAMP Server 11.10 on an old desktop PC.
I followed it with an Installation of WP into my /var/www/ folder
During the install (from my browser) I got the message "Unable to write wp-config.php" and wp spit out some text for me to copypasta and install manually.
I did so... and moved the new file to /var/www/ using ssh.
The site went up... http://www.re-computer.org/
upon trying to log in, I am presented with a white screen ... same for trying to access the admin tools.
I can't help but think that this has something to to with the general problem of "Unable to write" that I encountered during install.