How Error: mount: unknown filesystem type ‘ext4’ came up

Debian Distro LogoAfter a power cycle I couldn’t remount my Truecrypt drives on my Debian server. I stopped the server in a clean manner and I hadn’t done any upgrade. I use a script to mount them so I knew I wasn’t using a different command line… Only the password could have been erroneous as I’m not saving it in the script.

Finding the root cause

I searched for the error message Error: mount: unknown filesystem type 'ext4' and I got a list of reasons why I would have an issue on Lenny or lower than kernel 2.6.28 but I use 2.6.32 where ext4 is supported as standard. There are so many articles explaining how to use ext4dev on earlier kernels that it was hiding any potential solution to my problem on a recent kernel.

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