------- Comment From frede...@fr.ibm.com 2018-05-04 03:55 EDT-------
Hi,
I tried with the bionic iso and a virtual machine with a multipath setup based 
on backend file and everything went fine :
---
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native'/>
<source file='/home/fbonnard/ubuntuimage'/>
<backingStore/>
<target dev='sda' bus='scsi'/>
<serial>0001</serial>
<alias name='scsi0-0-0-0'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native'/>
<source file='/home/fbonnard/ubuntuimage'/>
<backingStore/>
<target dev='sdb' bus='scsi'/>
<serial>0001</serial>
<alias name='scsi0-0-0-1'/>
<address type='drive' controller='0' bus='0' target='0' unit='1'/>
</disk>
---

I passed disk-detect/multipath/enable=true to the installer and everything went 
fine :
root@vm80:/home/ubuntu# lsblk
NAME             MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda                8:0    0     3G  0 disk
??sda1             8:1    0     7M  0 part
??sda2             8:2    0     3G  0 part
??mpatha         253:0    0     3G  0 mpath
??mpatha-part1 253:1    0     7M  0 part
??mpatha-part2 253:2    0     3G  0 part  /
sdb                8:16   0     3G  0 disk
??sdb1             8:17   0     7M  0 part
??sdb2             8:18   0     3G  0 part
??mpatha         253:0    0     3G  0 mpath
??mpatha-part1 253:1    0     7M  0 part
??mpatha-part2 253:2    0     3G  0 part  /

root@vm80:/home/ubuntu# multipath -ll
mpatha (0QEMU_QEMU_HARDDISK_0001) dm-0 QEMU,QEMU HARDDISK
size=3.0G features='0' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=1 status=active
| `- 0:0:0:0 sda 8:0  active ready running
`-+- policy='service-time 0' prio=1 status=enabled
`- 0:0:0:1 sdb 8:16 active ready running
root@vm80:/home/ubuntu# ls -ltr /dev/mapper/
total 0
crw------- 1 root root 10, 236 May  4 08:40 control
lrwxrwxrwx 1 root root       7 May  4 08:40 mpatha -> ../dm-0
lrwxrwxrwx 1 root root       7 May  4 08:40 mpatha-part1 -> ../dm-1
lrwxrwxrwx 1 root root       7 May  4 08:40 mpatha-part2 -> ../dm-2

root@vm80:/home/ubuntu# mount |grep ext4
/dev/mapper/mpatha-part2 on / type ext4 
(rw,relatime,errors=remount-ro,data=ordered)

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https://bugs.launchpad.net/bugs/1769039

Title:
  Ubuntu1804 installer is not able to detect SAN disks(mulitpath disks)
  with 'No disk drive was detected' message.

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