I create a RAID 5 Volume with 5 Hard Disks by Hardware RAID, and intend to install ubuntu-server 18.04 by USB.

First I encounter MODSIGN: Couldn't get UEFI db list, unable to open /dev/sda enter image description here

after few seconds it automatically jumped to ubuntu installation scene. next error happened at partition. I am going store OS System (/, /boot) under a non-RAID Hard Disk separated from RAID Volume, and put /home under RAID Disk, as long as I selected any RAID Disk, the failed screne will show:

An error occurred during installation curtin command install ...

enter image description here

more detail log: mdadm: (non-fatal) write to /sys/class/block/md127/md/sync_max failed Permission denied enter image description here

I can successfully install ubuntu-server 18.04 on a Non-RAID Disk, but this error happened at any time I choose a RAID Disk to for whatever partition like /, /boot or /home. How to solve it ?


I have the same error.

You use this Ubuntu server version http://releases.ubuntu.com/18.04.1/ubuntu-18.04.1-live-server-amd64.iso named live-server.
This version use new subiquity installation system without RAID support.

Solution: if you want to install Ubuntu with RAID, you need to use Ubuntu with old installation system available here: http://cdimage.ubuntu.com/ubuntu/releases/bionic/release/

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  • Thank you harobed, alternative is the right way. I figured they got it all worked out since it's an option again in the live-server install. I figured wrong... – dgreene Oct 15 '18 at 1:13

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