The Apache Arrow project has been observing jobs sporadically failing with the following syndrome:
W: http://ppa.launchpad.net/couchdb/stable/ubuntu/dists/trusty/Release.gpg: Signature by key 15866BAFD9BCC4F3C1E0DFC7D69548E1C17EAB57 uses weak digest algorithm (SHA1) W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://packagecloud.io/github/git-lfs/ubuntu trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6B05F25D762E3157 W: Failed to fetch https://packagecloud.io/github/git-lfs/ubuntu/dists/trusty/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6B05F25D762E3157 E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/main/binary-i386/Packages.gz Hash Sum mismatch W: Some index files failed to download. They have been ignored, or old ones used instead. The command "if [ $TRAVIS_OS_NAME == "linux" ]; then sudo bash -c "echo -e 'Acquire::Retries 10; Acquire::http::Timeout \"20\";' > /etc/apt/apt.conf.d/99-travis-retry" sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test sudo apt-get update -qq fi " failed and exited with 100 during . Your build has been stopped.
Let us know if there is a workaround that we can apply.