To install manpages for “Library calls (functions within program libraries)”, use this

sudo apt-get install manpages-dev

In order to make postfix forward all mails from “root”, to a non-local email, the Postfix virtual alias table format must be used.

Start by making a file called /etc/postfix/virtual, with this content

root    receiver_email@non_local_host

Then run the below, to make a virtual lookup table.

sudo postmap /etc/postfix/virtual

To enable the virtual alias, insert the below into /etc/postfix/main.cf

virtual_alias_maps = hash:/etc/postfix/virtual

Now restart postfix, and send a mail to root

sudo /etc/init.d/postfix restart
echo "hmm" | sendmail root

This worked for me at Ubuntu Dapper and Ubuntu Edgy.

After re-installing mythtv on Ubuntu Dapper (link), mythfilldatabase gives this error:

Grabbing XMLTV data using tv_grab_dk is not supported. You may need to upgrade to the latest version of XMLTV.

Therefore I made this little script, and placed it in /etc/cron.daily

#!/bin/sh
DATAFILE=/tmp/data.$$
tv_grab_dk --config-file /home/mythtv/.mythtv/TDC.xmltv > $DATAFILE
mythfilldatabase --file 2 -1 $DATAFILE
mythbackend --resched