This bug was fixed in the package snapd - 2.26.1+17.10

---------------
snapd (2.26.1+17.10) artful; urgency=medium

  * New upstream release, LP: #1690083
    - store: fix panic error in auth
    - tests: the new ubuntu-image snap needs classic confinement, adjust
      tests
    - cmd/snap-confine: don't fail on pre 3.8 kernel

snapd (2.26) xenial; urgency=medium

  * New upstream release, LP: #1690083
    - timeutil: avoid panicking when the window is very small
    - image: fix go vet issue
    - overlord/ifacestate: don't spam logs with harmless auto-connect
      messages
    - interfaces/builtin: add network-status interface
    - interfaces/builtin: add online-accounts-service interface
    - interfaces/builtin: distribute code of touching allInterfaces
    - interfaces: API additions for interface hooks
    - interfaces/builtin: add storage-framework-service interface
    - tests: disable create-key test on ppc64el for artful (expect not
      working)
    - snap: make `snap prepare-image --extra-snaps` derive side info
    - tests: unify tests/{main/completion,completion}/lib.exp0
    - cmd/snap: tweak info channels output
    - interfaces: ensure that legacy interface methods are unused
    - packaging: cleanup how built-using is generated
    - tests: extend kernel-module-control interface test
    - interfaces/network: workaround Go's need for NETLINK_ROUTE with
      'net'.
    - cmd/snap-confine: use defensive argument parser
    - tests: add test for empty snap name on revert
    - overlord/hookstate: remove unused Context.timeout
    - tests: additional setup in docker test for core systems
    - configstate: return error if patch is invalid
    - interfaces: add random interface
    - store, daemon, client, cmd/snap: handle PASSWORD_POLICY_ERROR
    - cmd/snap, client: add "whoami" command
    - cmd/snap: iterate interface tab completion
    - snap: move locale-control to only be present on classic
    - interfaces/browser-support: deny read on squashfs backing files
      and LVM vg names
    - tests: wait for the docker socket to be listening
    - snap: add `snap refresh --time` option
    - tests: re-enable and moderninze /media sharing test
    - cmd: make rst2man optional
    - tests: remove quoting from [[ ]] when globs
    - interfaces: allow plugging DBus clients to introspect the slot
      service
    - packaging/ubuntu*/changelog: drop extra dash
    - snap-confine: init the ENTRY variable, coverity is unhappy
      otherwise
    - cmd/snap-confine/spread-tests: discard useless --version test
    - spread: add spread target qemu:debian-9-64
    - interfaces: mediate netlink sockets via seccomp
    - tests,cmd/snap-confine: port older snapd-discard-ns tests
    - cmd/snap-confine/tests: fix shellcheck on recently added files
    - tests/upgrade: force install core snap from beta for debian
    - overlord/snapstate/backend,interfaces/mount: move ns management
      code.
    - tests: extend network-control spread test to cope with network
      namespaces
    - tests: fail early in the spread suite if trying to run it inside a
      container
    - tests: set ownership of $PROJECT_PATH for the external backend
    - tests: specify the auto-refreshable snap being tested
    - many: fix tests with go1.8 / artful
    - fix for tests: debian does not have /snap/bin in secure_path so
      sudo
    - snap: support for snap tasks --last=...
    - cmd/snap-confine: remove obsolete debug message
    - address review feedback, add a lot of comments :-), call
      shellcheck on the completion scripts, fix a bug in compopt

 -- Michael Vogt <email address hidden>  Thu, 11 May 2017 21:44:27 +0200