travis: use focal (20.04)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.travis.yml

@@ -2,7 +2,9 @@
   # See appveyor.yml for windows build.
   sudo: required
   language: go
-  dist: trusty
+  dist: focal
+  services:
+    - xvfb # see https://docs.travis-ci.com/user/gui-and-headless-browsers/#using-xvfb-to-run-tests-that-require-a-gui
   osx_image: xcode10.1
   os:
     - linux
@@ -19,7 +21,6 @@
         - pass
   before_script:
     - make deps
-    - "export DISPLAY=:99.0"
     - "export GO111MODULE=off"
     - if [[ "$TRAVIS_OS_NAME" == "linux" && "$HOSTTYPE" != "ppc64le" ]]; then sh ci/before_script_linux.sh; fi
     - make validate

ci/before_script_linux.sh

@@ -1,10 +1,11 @@
 set -ex
 
-sh -e /etc/init.d/xvfb start
-sleep 3 # give xvfb some time to start
+# see https://github.com/keybase/keybase-issues/issues/2798
+GPG_TTY=$(tty)
+export GPG_TTY
 
 # init key for pass
-gpg --batch --gen-key <<-EOF
+gpg --batch --pinentry-mode=loopback --passphrase '' --generate-key <<-EOF
 %echo Generating a standard key
 Key-Type: DSA
 Key-Length: 1024