Question

UFW Installation - Ubuntu 12.04.x x64 vmlinuz-3.8.0-37-generic?

Posted April 27, 2014 3.8k views
Originally, I was currently trying to install UFW for security reasons on my WebServer (Which was originally running Ubuntu 12.04.x x64 vmlinuz-3.8.0-37-generic), following this guide here: https://www.digitalocean.com/community/articles/how-to-setup-a-firewall-with-ufw-on-an-ubuntu-and-debian-cloud-server Basically, I did a "sudo apt-get install ufw", and when I type "ufw status" the message I had received is as follows: "ERROR: problem running iptables: FATAL: Could not load /lib/modules/3.8.0-37-generic/modules.dep: No such file or directory ... ip tables v1.4.12: can't initialize iptables table 'filter': Table does not exist ... Perhaps iptables or your kernel needs to be upgraded." Currently, I've reverted to Ubuntu 12.04.x x64 vmlinuz-3.2.0-60-virtual, and it now functions as it should (As I did a "ls /lib/modules/" and found the modules currently installed). Is there a way I can install modules/etc for Ubuntu 12.04.x x64 vmlinuz-3.8.0-37-generic, so UFW works on that kernel? (I'm new to this, so I'm not too familiar with the differences between some kernels). Thanks.
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6 answers
kamaln7 April 28, 2014
You're getting that error because you haven't installed the respective kernel package on your droplet which is why it can't find the iptables module.
I recommend setting your droplet to use the latest kernel available, installing its package, and then rebooting your droplet.
Currently it's 3.8.0-38-generic, so set your droplet to use "* Ubuntu 12.04.x x64 vmlinuz-3.8.0-38-generic", install the package: 
sudo apt-get install linux-image-vmlinuz-3.8.0-38-generic
and finally, power off your droplet and boot it up from the control panel: 
sudo poweroff
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mike611237 April 29, 2014
Thank you very much for the reply!
Though, to install the modules for the image I was currently using, I used:

sudo apt-get install linux-image-$(uname -r)

......But there is a still a problem remaining.

The module install worked great, though when I type "ufw status" after installing ufw, this message shows up (It's slightly different from my post above):

----------------
ERROR: problem running iptables: FATAL: Error inserting ip_tables (/lib/modules/3.8.0-38-generic/kernel/net/ipv4/netfilter/ip_tables.ko): Invalid module format
iptables v1.4.12: can't initialize iptables table 'filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs up be upgraded."
----------------

My current kernel is 3.8.0-38-generic, and there does exist a folder now for it in /lib/modules.

PS: Is there a large difference between "generic" and "virtual"?
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mike611237 April 29, 2014
So after some research and relating to my above question, I discovered that when I run the command "lsmod", the only thing I currently see listed is "floppy". There are no other modules loaded, which is probably the problem.

What would be the safest way to load all (or just the necessary) modules?

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kamaln7 April 29, 2014
Have you rebooted your droplet after installing the linux-image package?
See https://help.ubuntu.com/community/ServerFaq#What_are_the_differences_between_the_server_and_virtual_kernels.3F.
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mike611237 April 29, 2014
Yes. I've rebooted my droplet. The only module showing up is "floppy" after a reboot.
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dev483154 May 13, 2014
Any luck with this problem? I'm having the same, after an attempt to resize my droplet..
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