This bug was fixed in the package snapd - 2.21~14.04.2

---------------
snapd (2.21~14.04.2) trusty; urgency=medium

  * New upstream release, LP: #1656382:
    - trusty backport
    - remove debian/tests/control golang-golang-x-net-dev dependency
      to make autopkgtests work

snapd (2.21~14.04.1) trusty; urgency=medium

  * New upstream release, LP: #1656382:
    - trusty backport

snapd (2.21) xenial; urgency=medium

  * New upstream release, LP: #1656382
    - daemon: re-enable reexec
    - interfaces: allow reading installed files from previous revisions
      by default
    - daemon: make activation optional
    - tests: run all snap-confine tests in c-unit-tests task
    - many: fix abbreviated forms of disconnect
    - tests: switch more tests to MATCH
    - store: export userAgent. daemon: print store.UserAgent() on
      startup.
    - tests: test classic confinement `snap list` and  `snap info`
      output
    - debian: skip snap-confine unit tests on nocheck
    - overlord/snapstate: share code between Update and UpdateMany, so
      that it deals with auto-aliases correctly
    - interfaces: upower-observe: refactor to allow snaps to provide a
      slot
    - tests: add end-to-end store test for classic confinement
    - overlord,overlord/snapstate: have UpdateMany retire/enable auto-
      aliases even without new revision
    - interfaces/browser-support: add @{PROC}/@{pid}/fd/[0-9] w and misc
      /run/udev
    - interfaces/builtin: add physical-memory-* and io-ports-control
    - interfaces: allow getsockopt by default since it is so commonly
      used
    - cmd/snap, daemon, overlord/snapstate: tests and fixes for "snap
      refresh" of a classic snap
    - interfaces: allow read/write access of real-time clock with time-
      control interface
    - store: request no CDN via a header using SNAPPY_STORE_NO_CDN
      envvar
    - snap: add information about tracking channel (not just actual
      channel)
    - interfaces: use fewer dot imports
    - overlord/snapstate: remove restrictions on ResetAliases
    - overlord, store: move confinement filtering to the overlord (from
      The Store)
    - many: move interface test helpers to ifacetest package
    - many: implement 'snap aliases'
    - vet: fix for unkeyed fields error on aliases_test.go
    - interfaces: miscellaneous policy updates for network-control,
      unity7, pulseaudio, default and home
    - tests: test for auto-aliases
    - interface hooks: connect plug slot hooks (step 2)
    - cmd/snap: fix internal naming in snap connect
    - snap: use "size" as the json tag in snap.ChannelSnapInfo
    - tests: restore the missing initialization of iface manager causing
      race
    - snap: fix missing sizes in `snap info <remote-snap>`
    - tests: improve cleanup for c-unit-tests
    - cmd/snap-confine: build non-installed libsnap-confine-private.a
    - cmd/snap-confine: small tweaks to seccomp support code
    - interfaces/docker-support: allow /run/shm/aufs.xeno for 14.04
    - many: obtain installed snaps developer/publisher username through
      assertions
    - store: setting of fields for details endpoint
    - cmd/snap-confine: check for rst2man on configure
    - snap: show `snap --help` output when just running `snap`
    - interface/builtin: drop the obsolete checks in udisks2
      SanitizeSlot
    - cmd/snap: remove currency switch following UX review
    - spread: find top-level directory before running generate-
      packaging-dir
    - interface hooks: prepare plug slot hooks (step 1)
    - i18n: use github.com/mvo5/gettext.go (pure go) for i18n to avoid
      cgo
    - many: put a marker in the User-Agent sent by snapd/snap when under
      testingThe User-Agent will look like:
    - tests: fix -reuse and -resend when govendor is missing
    - snap: provide friendlier `snap find` message when no snaps are
      found
    - tests: fix mkversions.sh failure on zesty
    - spread: install build-essential unconditionally
    - spread: improve qemu ubuntu-14.04-{32,64} support
    - overlord/snapstate,daemon: implement GET /v2/aliases handling
    - store: retry user info request
    - tests: port more snap-confine regression tests
    - tests: cancel the scheduled reboot on ubuntu-core-upgrade-no-gc
      and restore state
    - tests: debug zesty autopkgtest failures
    - overlord/snapstate: use keyed fields on literals
    - tests: use MATCH in install-remove-multi
    - tests: increase wait time for service to be up
    - tests: make debug-each succeed if DENIED doesn't match
    - tests: skip packaging dir generation for non-git based autopkgtest
      runs
    - tests: port refresh-all-undo to MATCH
    - tests: improve snap connect test
    - tests: port additional snap-confine regression tests
    - tests: show --version when it matches unknown
    - tests: optionally use apt proxy for qemu
    - tests: add hello-classic test
    - many: behave more consistently when pointed to staging and
      possibly the fake store
    - overlord/ifacestate: remove stale comments
    - interfaces/apparmor: ignore snippets in classic confinement
    - tests: port first regression test from snap-confine
    - cmd/snap-confine: disable old tests

snapd (2.20.1~14.04) trusty; urgency=medium

  * New upstream release, LP: #1648520
    - first trusty backport

 -- Michael Vogt <email address hidden>  Tue, 17 Jan 2017 11:42:00 +0100