Problems updating my Debian Distribution, or do you know MMAP?

I was recently trying to update my Debian (lenny/sid) distro and ran into some problems I never had so far:
When calling

apt-get update

I got the following error message:

E: Dynamic MMap ran out of room
E: Ein Fehler trat beim Bearbeiten von g++-4.2 auf (NewVersion1)
E: Problem with MergeList /var/lib/dpkg/status

After digging around I found a solution for my problem:
Increase the Cache Limit size of APT in /etc/apt/apt.conf like this:

APT::Cache-Limit 80000000;

Be careful not to set the size too high!

Installation of Canon Pixma 4300 under Debian Linux using CUPS

I bought a new printer (Canon Pixma 4300) and had a few problems installing it under Debian Linux. I found a very good installation instruction and I would like to share it with you.

Install necessary packages

sudo apt-get install alien libxml1 libpng3 libtiff4

Download original drivers

wget ftp://download.canon.jp/pub/driver/bj/linux/cnijfilter-common-2.70-1.i386.rpm
wget ftp://download.canon.jp/pub/driver/bj/linux/cnijfilter-ip4300-2.70-1.i386.rpm

Convert RPMs into Debian packages

sudo alien -d cnijfilter-common-2.70-1.i386.rpm
sudo alien -d cnijfilter-ip4300-2.70-1.i386.rpm --scripts
sudo dpkg -i nijfilter-common-2.70-1.i386.deb
sudo dpkg -i cnijfilter-ip4300-2.70-1.i386.deb

Create symlinks

sudo ln -s /usr/lib/libpng12.so.0 /usr/lib/libpng.so.2
sudo ln -s /usr/lib/libtiff.so.4 /usr/lib/libtiff.so.3

Restart CUPS

sudo ldconfig
sudo /etc/init.d/cupsys restart

What is needed to run a X Server on Debian Linux

Today I installed a Debian (etch) system from scratch and wanted to start a X server... hm ... no X server on a fresh installation. So what packages do I have to install to get a X server running on my system?

apt-get install x11-common xserver-xorg-core xserver-xorg xfonts-base xterm

If you prefer a small and fast window manager and no desktop like KDE or Gnome try out enlightenment.

apt-get install enlightenment

Running Confluence behind Apache2

I decided to run my personal Confluence installation behind the Apache2 server running on my Debian Linux box using the mod_proxy configuration. I followed the instructions on Atlassians documentation pages (When using Debian it is described in the Jira docs) but ran into a problem afterwards.
Confluence was not accessible and I received a "Permission Denied" error when accessing confluence over HTTP (http://quebbemann.kicks-ass.net/confluence/).
The solution was to enable the Apache module proxy_http:
a2enmod proxy_http
After a Apache restart everything worked as expected!

Linux IMAP Server using Postfix and Procmail

I switched from POP3 to IMAP on my Debian Linux box and had some problems setting up my local delivery transport using Postfix and Procmail. I use Dovecot as my IMAP server and I decided to move from mbox format to Maildir.
To make this happen I had to tell Postfix that I now use Maildir instead of mbox. Just add the following line in /etc/postfix/main.cf:
home_mailbox = Maildir/
Now you have to tell Procmail to use Maildir instead of mbox. To do this, create a file called .procmailrc in your users home directory and add the following line:
DEFAULT=$HOME/Maildir/
Now all my problems are gone and I have a working IMAP system using:

• Dovecot (IMAP Server)
• Postfix (MTA)
• Procmail (LDA)

Serendipity Installation Problem solved (MySQL Database Setup)

I was trying to install Serendipity 1.0-beta3 and was facing problems with my MySQL database setup. The installer complained about a missing database module.
On my Debian system the debian package of the PHP Mysql module "php4-mysql" was installed into the directory
/usr/lib/php4/20050606
My "php.ini" file had the "extension_dir" set to "./"
So the Mysql module could not be found.
Solution:

1. I created a new directory /usr/local/share/php/extensions and switched into it.
2. I linked the mysql.so to the original location using the command:
1. ln -s /usr/lib/php4/20050606/mysql.so mysql.so
3. I set the "extension_dir" variable in the file "php.ini" to "/usr/local/share/php/extensions"
4. Restart of my Apache2 webserver.

Yep, it's working now