Server install on usb device fails

[Nick Grealy]

1. Copy 18.04-live-server-amd64 iso to an "install" usb
2. Boot using "install" usb
3. Select default installation options...
4. Select, Install to a new disk
5. Select a second "os" usb (16GB), to install to (allow default partioning suggestion)
6. Press "Continue", and wait.
7. The following error is presented

(see attached screenshot)
...
OSError: [Errno 6] No such device or address: '/dev/sde2'
...

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: curtin 18.1-5-g572ae5d6-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Sat Apr 28 03:51:04 2018
LiveMediaBuild: Ubuntu-Server 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: curtin
UpgradeStatus: No upgrade log present (probably fresh install)

[Nick Grealy (nickgrealy)]

Problem occurred with: ubuntu-18.04-live-server-amd64.iso
Did not occur with: ubuntu-18.04-server-amd64.iso

[Ryan Harper (raharper)]

Thanks for report.

I've seen this on drives which use msdos logical/extended partitioning.

[Ryan Harper (raharper)]

This has been fixed in upstream curtin here:

https://git.launchpad.net/curtin/commit/?id=4bf7750b6010f0483b22ff626eab58d6a85bb072

At some point the live installer will pick up the newer curtin release with this fix included.