Public bug reported:
Some system file system (proc and sys) mounted with 'mount --bind' on an
host system could not be unmounted by the installer. Trying to go back
as proposed by the installer causes the installation failure.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Thu Jul 5 18:06:38 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed
boot=casper quiet splash ---
LiveMediaBuild: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: ubiquity (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic ubiquity-18.04.14 xubuntu
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https://bugs.launchpad.net/bugs/1780226
Title:
Unable to umount partition mounted in chroot mode
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