I ended up here with a very similar error to Fontconfig error: cannot load default config file launching the latest google-chrome-stable (Version 65.0.3325.181 (Official Build) (64-bit)) from the command line with the intent of locking it to the launch bar. The aforementioned which I received when updating today.
The exact output received is as follows:
$ google-chrome-stable
Fontconfig warning: "/etc/fonts/fonts.conf", line 146: blank doesn't take any effect anymore. please remove it from your fonts.conf
ATTENTION: default value of option force_s3tc_enable overridden by environment.
[4946:4946:0321/143522.945617:ERROR:gpu_process_transport_factory.cc(1019)] Lost UI shared context.
[1:10:0321/143522.993869:ERROR:command_buffer_proxy_impl.cc(114)] ContextResult::kFatalFailure: Shared memory handle is not valid
[4946:4985:0321/143528.000996:ERROR:upload_data_presenter.cc(73)] Not implemented reached in virtual void extensions::RawDataPresenter::FeedNext(const net::UploadElementReader &)
[4946:4985:0321/143528.189366:ERROR:upload_data_presenter.cc(73)] Not implemented reached in virtual void extensions::RawDataPresenter::FeedNext(const net::UploadElementReader &)
[4946:4985:0321/143528.302925:ERROR:upload_data_presenter.cc(73)] Not implemented reached in virtual void extensions::RawDataPresenter::FeedNext(const net::UploadElementReader &)
[4946:4985:0321/143528.761029:ERROR:upload_data_presenter.cc(73)] Not implemented reached in virtual void extensions::RawDataPresenter::FeedNext(const net::UploadElementReader &)
Fontconfig error: line 152: mismatched tag
Fontconfig error: Cannot load default config file
[4946:4985:0321/143809.554796:ERROR:upload_data_presenter.cc(73)] Not implemented reached in virtual void extensions::RawDataPresenter::FeedNext(const net::UploadElementReader &)
Fontconfig error: Cannot load default config fileI see it in a couple of issues, ie. here's one – Oct 02 '19 at 04:23Fontconfig error: Cannot load default config fileI made an issue about it, because it's due to sandboxing: https://bugs.chromium.org/p/chromium/issues/detail?id=1010388 – Oct 02 '19 at 05:25