There is a new version of the vpnc-script that works for me, that can be found here:
http://git.infradead.org/users/dwmw2/vpnc-scripts.git/blob_plain/HEAD:/vpnc-script
Exchange it as descriped here:
http://blog.nowherelan.com/2011/10/10/vpnc-on-ubuntu-oneiric-error-either-to-is-duplicate-or-ipid-is-a-garbage/
but make sure to backup your old script!
There is a new version of the vpnc-script that works for me, that can be found here:
http:// git.infradead. org/users/ dwmw2/vpnc- scripts. git/blob_ plain/HEAD: /vpnc-script
Exchange it as descriped here:
http:// blog.nowherelan .com/2011/ 10/10/vpnc- on-ubuntu- oneiric- error-either- to-is-duplicate -or-ipid- is-a-garbage/
but make sure to backup your old script!