I have the same problem.My Asus Tinker Board T hangs in the same spot when issuing an sudo apt update or sudo apt-get update.
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Ign:8 file:/opt/aiy/packages ./ Translation-en
0% [Connecting to mendel-linux.org] [Connecting to debian.map.fastly.net (2a04:4e42:62::644)]
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Is there a fix for this?