Identical mount points for two file systems error

[Cameron Hart]

When attempting to install 16.04 Beta 2 by upgrading 15.10, I get the following error:

Identical mount points for two file systems

Two file systems are assigned the same mount point (/boot/efi): SCSI1 (0,0,0), partition #2 (sda) and SCSI5 (0,0,0), partition #1 (sdb).

Please correct this by changing mount points.

If I click OK I'm taken to the partition editor which appears to scan my drives but then doesn't show any particles. If I click on any partition editing buttons, ubiquity then crashes.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.51 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
Uname: Linux 4.4.0-15-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CasperVersion: 1.368
CurrentDesktop: Unity
Date: Thu Apr 7 13:52:09 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Cameron Hart (bitshifternz)]

I looked into this a bit more. I have two drives which both had EFI partitions on them . However one of the EFI partitions was empty and was actually unused. I deleted the empty EFI the partition and I didn't get this bug and partition manager stopped crashing.

The unused EFI partition was on the Samsung SSD drive.

[Cameron Hart (bitshifternz)]

That was /dev/sdb1.

[Simon Quigley (tsimonq2)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to look at all reported bugs in a timely manner. There have been many changes in Ubuntu since that time you reported the bug and your problem may have been fixed with some of the updates. It would help us a lot if you could test it on a currently supported Ubuntu version. If you test it and it is still an issue, kindly upload the updated logs by running only once:
apport-collect 1567462

and any other logs that are relevant for this particular issue.

[Launchpad Janitor (janitor)]

[Expired for ubiquity (Ubuntu) because there has been no activity for 60 days.]

[Gail (gh0988)]

I got exactly the same problem - ubiquity crash - at the same step - trying to re-install Ubuntu 18.04.1.
   Two file systems are assigned the same mount point (/boot/efi)...
   Please correct this by changing mount points

If I click OK I'm taken to the partition editor which appears to scan my drives but then doesn't show any data. If I click on the "next" button, ubiquity then crashes.

Ubiquity 18.04.14.6
"Ubiquity crashed with AttributeError in ok_handler(): 'NoneType' object has no attribute 'endswith' "
Casper version 1.394
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18

[maarten (info-maartenabbring)]

Same thing here as #6 with ubuntu 18.10