How to start and stop NetworkManager?


I am using Ubuntu Gutsy and have discovered that when I suspend my
laptop (a Dell D600) I cannot connect to the network after resuming
sometimes.  I cannot get it going with an ifup, as it complains that
there are no interfaces defined (and they are not
in /etc/network/interfaces anymore).  I thought I had the problem fixed
by killing NetworkManager in
the /etc/acpi/suspend.d/, and starting in again
in /etc/acpi/resume.d/, but after a few suspend cycles, I have
another problem.  It acts like NetworkManager cannot decide which
wireless network to connect to, and I keep loosing my connection.  If I
reboot, it works flawlessly until I've suspended a few too many times.
It also works fine when there aren't too many choices of networks even
after a number of suspend cycles.  I suspect I am killing NetworkManager
at a bad time, and confusing its database or something.  I can't find
any information on how to stop and start NetworkManager.  NetworkManager
start and NetworkManager stop don't seem to work for me.  Can anyone
point me in the right direction?



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