gcc 7 cannot work yet on travis...
diff --git a/.travis.yml b/.travis.yml
index 1a35b34..de027c5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -142,7 +142,6 @@
 
     # GCC 7
     - env: COMPILER=g++-7 HAS_ASAN_32=true HAS_UBSAN_32=true HAS_ASAN_64=true HAS_UBSAN_64=true ADDITIONAL_CXX_FLAGS=" -fuse-ld=gold"
-      dist: trusty
       compiler: gcc
       addons: &gcc7
         apt:
@@ -280,7 +279,6 @@
 
     # GCC 7
     - env: COMPILER=g++-7 HAS_ASAN_32=true HAS_UBSAN_32=true HAS_ASAN_64=true HAS_UBSAN_64=true ADDITIONAL_CXX_FLAGS=" -fuse-ld=gold"
-      dist: trusty
       compiler: gcc
       addons: &gcc7
         apt: