Oh, the problem here might be that we only install `fontconfig:i386` which is for the 32 bit architecture, but not `fontconfig` for 64 bit applications and as such no font cache is being built. https://searchfox.org/mozilla-central/rev/158bac3df3a1890da55bdb6ffdaf9a7ffc0bfb0a/taskcluster/docker/recipes/ubuntu1804-test-system-setup.sh#92 I just pushed a try build to check that: https://treeherder.mozilla.org/#/jobs?repo=try&revision=f6a55c6684527bce86d638e75c9132534c4e5427
Bug 1633101 Comment 17 Edit History
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Oh, the problem here might be that we only install `fontconfig:i386` which is for the 32 bit architecture, but not `fontconfig` for 64 bit applications and as such no font cache is being built. https://searchfox.org/mozilla-central/rev/158bac3df3a1890da55bdb6ffdaf9a7ffc0bfb0a/taskcluster/docker/recipes/ubuntu1804-test-system-setup.sh#92 I just pushed a try build to check that: https://treeherder.mozilla.org/#/jobs?repo=try&revision=b8a5acfddea0fa213a5a2784d2b3b55ef9e3a610