after upgrating to ubuntu 11.04, I lost dnsmasq.
When I run
/usr/sbin/dnsmasq start I get
dnsmasq: junk found in command line
Apparently I need to downgrade dnsmasq but Package->Force version is not available for it in synaptic.
Don't downgrade. If you have package dns-root-data installed and are able to remove this then this will "fix" the dnsmasq problem.
Elsewhere, I have seen it mentioned that this is due to systemd adding rubbish into the dnsmasq configuration - this may not be actually true!
A reboot may be necessary.