Try to fix travis installation of gcc-8 on xenial.

83bf24e7 · Stefan Behnel · cffb63d3 · 83bf24e7
Commit 83bf24e7 authored Jul 28, 2018 by Stefan Behnel
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.travis.yml .travis.yml +1 -1

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--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ sudo: false
 addons:
  apt:
    sources:
-      - ubuntu-toolchain-r-test
+      - sourceline: 'ppa:ubuntu-toolchain-r/test'
    packages:
      - gdb
      - python-dbg