Kernel module for Cisco VPN client doesn't compile under ubuntu 10.04 LTS?

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http://unix.stackexchange.com – I am trying to install a Cisco VPN client under Ubuntu 10.04 LTS. In the extracted folder I type: alex@alex-laptop:~/Downloads/cisco4.8/vpnclient$ sudo ./vpn_install and there is output of activity which appears to end unsuccessfully with: /home/alex/Downloads/cisco4.8/vpnclient/linuxcniapi.c:458: error: ‘struct sk_buff’ has no member named ‘nh’ make[2]: *** [/home/alex/Downloads/cisco4.8/vpnclient/linuxcniapi.o] Error 1 make[1]: *** [_module_/home/alex/Downloads/cisco4.8/vpnclient] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-33-generic' make: *** [default] Er (HowTos)