People using VPN software indeed face this issue. See : 
http://ubuntuforums.org/showthread.php?t=1459559&highlight=module+tun+aventail&page=3
 

This link mentions a work-around :

sudo apt-get install build-essential linux-headers-`uname -r`
mkdir faketun
cd faketun
echo -e "#include <linux/module.h>\nstatic int start__module(void) {return 
0;}\nstatic void 
end__module(void){return;}\nmodule_init(start__module);\nmodule_exit(end__module);">tun.c
echo -e "obj-m += tun.o\nall:\n\tmake -C /lib/modules/\$(shell uname -r)/build/ 
M=\$(PWD) modules\nclean:\n\tmake -C /lib/modules/\$(shell uname -r)/build/ 
M=\$(PWD) clean\nclean-files := Module.symvers">Makefile
make
sudo install tun.ko /lib/modules/`uname -r`/kernel/net/tun.ko
sudo depmod -a
sudo modprobe tun


But clearly an updated package with tun.o needs to be released - as it is an 
important module which was provided in the past.

-- 
TUN kernel module (tun.ko) not available in lucid lynx standard kernel
https://bugs.launchpad.net/bugs/565856
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