Upgrading mysql on Ubuntu Lucid Lynx (10.04) hangs

Already the third time this happens to me: An update is available for the mysql server and I just "apt-get upgrade". The upgrade process gets totally stuck at the following task:
Preparing to replace mysql-server-5.1 5.1.66-0ubuntu0.10.04.1 (using .../mysql-server-5.1_5.1.66-0ubuntu0.10.04.2_i386.deb) ...
mysql stop/waiting

The process that got again stuck in some eternal loop (or whatever) is an egrep replacement of some textfile:
egrep -qi -r ^[^#]*ndb.connectstring|^[:space:]*\[[:space:]*ndb_mgmd /etc/mysql/

A permanent static route in Ubuntu Karmic Koala (9.10), Precise Pangolin (12.04) & Trusty Tahr (14.04)

Karmic Koala
To add a permanent static route to a Karmic Koala system with one NIC, you need to edit the
/etc/network/interfaces file. The following section needs to be replaced:

# The primary network interface
auto eth0
#iface eth0 inet dhcp

Modify as follows:
# The primary network interface
auto eth0
iface eth0 inet dhcp
up route add -net netmask gw
down route del -net netmask gw