Which is the best Wireless LAN Manager for Ubuntu Linux?
Is wicd the best one available?
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Network Manager is the default manager for Ubuntu. This doesn't mean it's the best, but it does mean that it's a very good solution.
Depending upon your needs, Network Manager is most likely going to provide all the functionality that you need, however, I prefer to use wicd, as it interferes less with other configurations.
If you have reasons to leave Network Manager, I would suggest wicd.
Asking which program is 'best' is often not the best way to find what you need. If you have a specific problem with Network Manager ask about that specifically, instead.
I used wicd for a long time, but I think Network Manager has matured quite a bit and is quite a decent all round network (including wifi) manager. Especially since it has support for VPN too.