Grub Error – /dev/mapper – Ubuntu Server Installation

If you have a raid setup you may encounter this error during the server installation:

Unable to install GRUB in /dev/mapper

Executing ‘grub-install ‘/dev/mapper’ failed.

This is a fatal error

To fix this simply do the following:

Press CTRL + ALT + F2 to open a terminal

type: ls -l /dev/mapper

in the list you will find the name of your RAID, something like:

/dev/mapper/sil_biagdfaeefg_ghj

write down the exact name that appears after /mapper/
eg. sil_biagdfaeefg_ghj

Press CTRL + ALT + F2 to return to the installation, and add the name of your RAID to /dev/mapper/

Now continue the installation.

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