networkmanager doesn't appear

["stefan broder bluewin ch" <stefan broder bluewin ch>]

hi! i've just installed the following packages on my ubuntu system:
- network-manager
- network-manager-gnome

afterwards i've added "sn-applet --sm-disable" to Session > Startup 
Programs and rebootet my notebook as recommended in a manual. but 
finally, when the machine started up i couldn't find or even start 
the networkmanager because it doesn't seem to be installed?! if i 
check in Synaptic Package manager everything seems to be installed 
properly.

why that? could anybody help me?

thanks a lot!

greeetz stefan