Ubuntu is a nightmware.

.travis.yml

@@ -8,7 +8,7 @@
 #
 #		Project file for the Travis CI remote builder service.
 #
-# Version:	@(#).travis.yml	1.0.9	2018/04/25
+# Version:	@(#).travis.yml	1.0.10	2018/05/08
 #
 # Authors:	Natalia Portillo, <claunia@claunia.com>
 #		Fred N. van Kempen, <decwiz@yahoo.com>
@@ -61,7 +61,9 @@ env:
     - PROG=VACRCem-dev CROSS=y DEBUG=y DEV_BUILD=y
 
 script:
-  - sudo apt-get install libz-mingw-w64 libz-mingw-w64-dev
+  - sudo apt-get update
+  - sudo apt-get install libz-mingw-w64
+  - sudo apt-get install libz-mingw-w64-dev
   - chmod +x .travis-build.sh .travis-deploy.sh
   - ./.travis-build.sh