Use Popey's fix

.travis.yml

@@ -6,22 +6,23 @@ env:
     - LC_ALL: C.UTF-8
     - LANG: C.UTF-8
     - SNAPCRAFT_ENABLE_SILENT_REPORT: y
-    - SNAPCRAFT_ENABLE_DEVELOPER_DEBUG: y
+    - PATH: /snap/bin:$PATH
 
 addons:
   snaps:
     - name: snapcraft
       channel: stable
       classic: true
     - name: http
-    - name: transfer
     - name: lxd
       channel: stable
 
-script:
-  - sudo apt update
-  - sudo /snap/bin/lxd.migrate -yes
-  - sudo /snap/bin/lxd waitready
+install:
+  - sudo apt autoremove --yes --purge lxd lxd-client
   - sudo /snap/bin/lxd init --auto
-  - mkdir -p "$TRAVIS_BUILD_DIR/snaps-cache"
-  - snapcraft --use-lxd
+  - sudo /snap/bin/lxd waitready
+script:
+  # Workaround until https://github.com/snapcore/snapcraft/pull/3240 is released.
+  - sudo bash -c "unset SUDO_USER && snapcraft --use-lxd"
+# after_failure:
+#   - http https://api.snapcraft.io/v2/snaps/info/core architecture==amd64 Snap-Device-Series:16