I have installed Chromium v38 from my Debian Jessie repositories and I’m facing the following error “Service unavailable; try again later” when a try to sign in from Chromium.

Until the new version v38 starts to work correctly, I will stick with previous one v37.

Download Chromium v37 packages from here.

chromium_37.0.2062.120-2_amd64.deb
chromium-l10n_37.0.2062.120-2_all.deb
chromium-inspector_37.0.2062.120-2_all.deb

apt-get purge chromium chromium-browser
cd ~/Download/
dpkg -i chromium_37.0.2062.120-2_amd64.deb chromium-l10n_37.0.2062.120-2_all.deb chromium-inspector_37.0.2062.120-2_all.deb
apt-mark hold chromium chromium-inspector chromium-l10n

You have to ‘hold‘ selected Chromium packages not to be updated. If you know new version already works fine, you may ‘unhold‘ those packages with similar command above.