mount: /mnt: unknown filesystem type 'ext4'

I am trying to install Arch Linux on VirtualBox, however, when I am trying to mount the filesystems I get an error: 'unknown filesystem type ext4'.

I know there is a lot of people ran into the same problem and there's plenty of information available on the net but I can't seem to find a solution.

the output of fdisk -l:

Root@archiso ~ fdisk –l
Disk /dev/sda: 64GiB, 68719476736 bytes, 134217728 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x17c5711e
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 411647 409600 200M 83 Linux
/dev/sda2 411648 8603647 8192000 3.9G 82 Linux swap / Solaris
/dev/sda3 8603648 134217727 125614080 59.9.G 83 Linux
Disk /dev/loop0: 403 MiB, 422539264 bytes, 825272 sectors

The error I get when I run mount /dev/sda3 /mnt:

mount: /mnt: unknown filesystem type 'ext4'.

By the way, how can I copy the contents of a command from VirtualBox Arch installer? I copied it the hard way! the mouse is invisible inside the ZSH and I can't use redirection > in order to save the contents as no filesystem is mounted.

Thanks.

1 Answer

Encountered the same problem with Arch guest on Virtualbox, solved by booting into live media, chrooting again into installed system:

# mount /dev/sda2 /mnt
# mount /dev/sda1 /mnt/boot
# arch-chroot /mnt

and reinstalling the kernel:

# pacman -S linux

Not sure why ext4 module gets removed, though.