Public bug reported: 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) ** Affects: os-prober (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: amd64 apport-bug regression-update zesty ** Tags removed: regression ** Tags added: regression-update -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1660159 Title: os-prober fails to see other installed systems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/os-prober/+bug/1660159/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs