Update based on default xenial distro.

Random-Liu · Random-Liu · commit 0973459d9cd4 · 2019-10-09T13:09:52.000-07:00
Signed-off-by: Lantao Liu &lt;lantaol@google.com&gt;
diff --git a/.travis.yml b/.travis.yml
@@ -21,16 +21,14 @@ cache:
     - "${HOME}/google-cloud-sdk/"
 
 before_install:
-  # libseccomp in trusty is not new enough, need backports version.
-  - sudo sh -c "echo 'deb http://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse' > /etc/apt/sources.list.d/backports.list"
   - sudo apt-get update
   # Enable ipv6 for dualstack integration test.
   - sudo sysctl net.ipv6.conf.all.disable_ipv6=0
 
 install:
   - sudo apt-get install btrfs-tools
-  - sudo apt-get install libseccomp2/trusty-backports
-  - sudo apt-get install libseccomp-dev/trusty-backports
+  - sudo apt-get install libseccomp2
+  - sudo apt-get install libseccomp-dev
   - sudo apt-get install socat
 
 before_script:
