Same problem in Zesty.
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Touch seeded packages, which is subscribed to apt in Ubuntu.
method mirror broken at 1.3
Status in apt package in Ubuntu:
After update to apt 1.3
deb mirror://mirrors.ubuntu.com/mirrors.txt yakkety main restricted
apt update get error
E: Method mirror has died unexpectedly!
E: Sub-process mirror received a segmentation fault.
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