Ubuntu 16.04 RC2 net installer won't detect AHCI drives

[borzwazie]

I have found that the RC2 version of Ubuntu 16.04, when installed via PXE, will not install on machines with the local hard drive set to AHCI mode. I have to reset the BIOS to use the legacy IDE mode instead, or the installer will not detect any disks. I have encountered this issue on Dell R220s, and Advantech FWA-1320, so it doesn't appear to be limited to a single hardware platform.

If I set the machine to Legacy IDE (or similar), the drive is detected, and the install proceeds normally.

[borzwazie (borzwazie)]

More information:

In the installer shell, I have found that parted_devices does not list any drives if run. lspci does detect my SATA controller (an Intel 8 Series/C220 Series chipset Family 6-port SATA controller (rev 05).

[borzwazie (borzwazie)]

So, more evidence:

If I get the latest daily, AHCI works again. This happened to me yesterday as well. If I get the latest daily, the disk detection seems to work for that day, but fails after the next daily is released.

Is the installer downloading something specific that doesn't play nice with the older installer? I have found that I can't seem to make 16.04 use an NFS mount to download packages, it always goes to the internet. This is super annoying.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.