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11.18 "apt-get update -u"时遭遇"There is no public key available for the following key IDs"

https://scz.617.cn/unix/200904201931.txt

Q:

apt-get update -u

... ... Reading package lists... Done W: There is no public key available for the following key IDs: 4D270D06F42584E6 W: You may want to run apt-get update to correct these problems

A:

apt-get install debian-keyring debian-archive-keyring apt-key update apt-get update -u