When you install the <tt>udev</tt> package in [[VE]] based on Debian-4.0 template, you can see may the following message:

The problem is that postinstall script tries to write to <tt>/proc/sys/kernel/hotplug</tt> file, and this operation is prohibited in a VE.To work around this problem, just comment the 125th line in <tt>/var/lib/dpkg/info/udev.postinst</tt> file, that writes to the <tt>/proc/sys/kernel/hotplug</tt> file. After that <tt>udev</tt> can be installed smoothly.

P.S. Don't forget to enable <tt>sysfs</tt> feature for the VE in question (by vzctl), in order for <tt>udev</tt> to be able to work.