More changes for Travis (and updated code.)

.travis.yml

@@ -62,9 +62,14 @@ env:
 
 before_install:
   # Kill off the (most likely running) APT daily update.
+  - sudo systemctl disable apt-daily.timer
+  - sudo systemctl stop apt-daily.timer
+  - sudo systemctl disable apt-daily.service
   - sudo systemctl stop apt-daily.service
   - sudo systemctl kill --kill-who=all apt-daily.service
-  - sleep 5
+  - sleep 10
+  - sudo rm -f /var/lib/dpkg/lock
+  # Now install some packages we need.
   - sudo apt-get install libz-mingw-w64-dev
 # - sudo apt-get install libpng-mingw-w64-dev