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I am trying to connect to my work VPN with vpnc, on my chromebook with Ubuntu 12.04.4 (64bit).

I have installed vpnc, and when I run it, after entering my user/password, I get the following errors:

Cannot find device "tun0"
Cannot find device "tun0"
Cannot find device "tun0"
Cannot find device "tun0"
resolvconf: Error: /run/resolvconf/interface either does not exist or is not a directory

Can anyone suggest why it cannot find this tun0 device, or how I should proceed from here? Do I need to install something such that tun0 can be found?

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    Create the tun device then bring it up: # openvpn --mktun --dev tun0 # ifconfig tun0 up – user269418 Apr 16 '14 at 6:52
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By default VPNC uses an ifmode of virtual point to point interface(ie tun). But it also has another mode that you can use, virtual ethernet interface(ie tap). Try using that, ie:

sudo vpnc example.conf --local-port 0 --ifmode tap

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