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Michel Dänzer authored
The APT archive used by the Ubuntu docker image can be slow, even timing out sometimes, causing spurious failures of the containers-build job. The Debian docker image uses deb.debian.org, which is backed by a content distribution network. One downside is that stretch only has GCC 6, whereas bionic had 7. Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
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