2017/06/08 14:59:05.845860 taskrunner.go:367: DEBUG: Running task 57 on Do: Mount snap "core" (1689)
2017/06/08 14:59:06.385118 taskrunner.go:367: DEBUG: Running task 58 on Do: Copy snap "core" data
2017/06/08 14:59:06.427446 taskrunner.go:367: DEBUG: Running task 59 on Do: Setup snap "core" (1689) security profiles
2017/06/08 14:59:06.685375 cmd.go:118: DEBUG: re-exec disabled by user
2017/06/08 14:59:06.691951 task.go:303: DEBUG: 2017-06-08T14:59:06+01:00 ERROR cannot setup mount for snap "core": cannot update mount namespace of snap "core": cannot update preserved namespace of snap "core": cannot update snap namespace: cannot switch mount namespace: invalid argument
2017/06/08 14:59:06.712667 task.go:303: DEBUG: 2017-06-08T14:59:06+01:00 ERROR cannot update mount namespace of snap "core": cannot update preserved namespace of snap "core": cannot update snap namespace: cannot switch mount namespace: invalid argument
2017/06/08 14:59:06.733899 taskrunner.go:367: DEBUG: Running task 58 on Undo: Copy snap "core" data
2017/06/08 14:59:06.774333 taskrunner.go:367: DEBUG: Running task 55 on Undo: Download snap "core" (1689) from channel "stable"
2017/06/08 14:59:06.797311 errtracker.go:159: errtracker.Report is *not* sent because SNAPPY_TESTING is set
2017/06/08 14:59:06.800428 errtracker.go:160: report: map[CoreSnapdBuildID:unknown KernelVersion:4.4.0-78-generic Revision:1689 ProblemType:Snap SnapdVersion:2.26.3+git324.g27a9d88.dirty Date:Thu Jun  8 14:59:06 2017 Snap:core ErrorMessage:change "install-snap": "Install \"core\" snap"
download-snap: Undoing
 snap-setup: "core" (1689) "stable"
validate-snap: Done
mount-snap: Undo
copy-snap-data: Undoing
setup-profiles: Error
 ERROR cannot setup mount for snap "core": cannot update mount namespace of snap "core": cannot update preserved namespace of snap "core": cannot update snap namespace: cannot switch mount namespace: invalid argument
 ERROR cannot update mount namespace of snap "core": cannot update preserved namespace of snap "core": cannot update snap namespace: cannot switch mount namespace: invalid argument
link-snap: Hold
setup-profiles: Hold
set-auto-aliases: Hold
setup-aliases: Hold
start-snap-services: Hold
run-hook: Hold DuplicateSignature:snap-install:
download-snap: Undoing
 snap-setup: "core"
validate-snap: Done
mount-snap: Undo
copy-snap-data: Undoing
setup-profiles: Error
 ERROR cannot setup mount for snap "core": cannot update mount namespace of snap "core": cannot update preserved namespace of snap "core": cannot update snap namespace: cannot switch mount namespace: invalid argument
 ERROR cannot update mount namespace of snap "core": cannot update preserved namespace of snap "core": cannot update snap namespace: cannot switch mount namespace: invalid argument
link-snap: Hold
setup-profiles: Hold
set-auto-aliases: Hold
setup-aliases: Hold
start-snap-services: Hold
run-hook: Hold Architecture:amd64 HostSnapdBuildID:f4b6cf3f5428dc8c7f4e80d803644db2038403a6 SnapConfineAppArmorProfileDpkgNewMD5Sum: DidSnapdReExec:no Channel:stable DistroRelease:Ubuntu 16.04 SnapConfineAppArmorProfileCurrentMD5Sum:48222764f959562761258fae6bf6199b]
2017/06/08 14:59:06.800551 handlers.go:204: Reported install problem for "core" as oops-not-sent
2017/06/08 14:59:06.842311 taskrunner.go:367: DEBUG: Running task 57 on Undo: Mount snap "core" (1689)