Documented at <https://wiki.ubuntu.com/KarmicKoala/ReleaseNotes#Automatic%20boot%20from%20a%20degraded%20RAID%20array%20not%20configured%20upon%20installation>:
The installer option to support "boot from a degraded array" does not properly configure the installed system. To correct this after installation, run {{{dpkg-reconfigure mdadm}}} after installation and select the option again. (Bug:462258)
Documented at <https:/ /wiki.ubuntu. com/KarmicKoala /ReleaseNotes# Automatic% 20boot% 20from% 20a%20degraded% 20RAID% 20array% 20not%20configu red%20upon% 20installation>:
The installer option to support "boot from a degraded array" does not properly configure the installed system. To correct this after installation, run {{{dpkg-reconfigure mdadm}}} after installation and select the option again. (Bug:462258)