[Bug 1660159] Re: os-prober fails to see other installed systems

[flocculant]

Disk partitioning :

Disk /dev/sdb: 111.8 GiB, 120034123776 bytes, 234441648 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x8736edad

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sdb1  *         4094 234441647 234437554 111.8G  5 Extended
/dev/sdb5            4096  51203314  51199219  24.4G 83 Linux
/dev/sdb6        51206144  92167081  40960938  19.5G 83 Linux
/dev/sdb7        92170240 122890943  30720704  14.7G 83 Linux
/dev/sdb8       122894336 149517382  26623047  12.7G 83 Linux

sd6 is the partition which was / when running update-grub.

sdb5 is Xenial
sdb7 is Yakkety
sdb8 is a newer Zesty

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https://bugs.launchpad.net/bugs/1660159

Title:
  os-prober fails to see other installed systems

Status in os-prober package in Ubuntu:
  Confirmed

Bug description:
  Running sudo update-grub I found that all the existing installations
  were lost from grub. Leaving just the running xubuntu in grub.

  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.9.0-15-generic
  Found initrd image: /boot/initrd.img-4.9.0-15-generic
  Found linux image: /boot/vmlinuz-4.9.0-12-generic
  Found initrd image: /boot/initrd.img-4.9.0-12-generic
  done

  Downgraded to os-prober_1.73ubuntu1 and rerun of update-grub showed
  the same.

  Downgraded to os-prober_1.70ubuntu5 and running update-grub now shows

  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.9.0-15-generic
  Found initrd image: /boot/initrd.img-4.9.0-15-generic
  Found linux image: /boot/vmlinuz-4.9.0-12-generic
  Found initrd image: /boot/initrd.img-4.9.0-12-generic
  Found Ubuntu 16.04.1 LTS (16.04) on /dev/sdb5
  Found Ubuntu 16.10 (16.10) on /dev/sdb7
  Found Ubuntu Zesty Zapus (development branch) (17.04) on /dev/sdb8

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: os-prober 1.73ubuntu2
  ProcVersionSignature: Ubuntu 4.9.0-15.16-generic 4.9.5
  Uname: Linux 4.9.0-15-generic x86_64
  ApportVersion: 2.20.4-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sun Jan 29 16:45:46 2017
  InstallationDate: Installed on 2016-06-11 (231 days ago)
  InstallationMedia: Xubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160611)
  SourcePackage: os-prober
  UpgradeStatus: No upgrade log present (probably fresh install)

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