Which is the best Wireless LAN Manager for Ubuntu Linux?
Is wicd the best one available?
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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.
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.