Try another IPv6 workaround for the Linux builds.
@@ -11,9 +11,7 @@ matrix:
# Linux-specific build stuff
- os: linux
dist: focal
- virt: vm
- sudo: required
- group: deprecated-2017Q4
+ virt: lxd
addons:
apt:
packages: [libavahi-client-dev, libgnutls28-dev, zlib1g-dev]
