install ros error ：Set up your keys timed out

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错误：

sudo apt-key adv --keyserver hkp://ha.pool.sks-
keyservers.net --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --
homedir /tmp/tmp.CPcLK5j7k0 --no-auto-check-trustdb --trust-model always --
keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg -
keyserver hkp://ha.pool.sks-keyservers.net --recv-key
421C365BD9FF1F717815A3895523BAEEB01FA116
gpg: requesting key B01FA116 from hkp server ha.pool.sks-keyservers.net
gpg: keyserver timed out
gpg: keyserver receive failed: keyserver error

环境：

硬件：friendlyarm NanoPi-M4

http://wiki.friendlyarm.com/wiki/index.php/NanoPi_M4/zh

系统：rk3399-sd-lubuntu-desktop-xenial-4.4-armhf-YYYYMMDD.img.zip

解决办法：

https://askubuntu.com/questions/880571/keyserver-timeout-when-trying-to-add-key

https://askubuntu.com/questions/574569/apt-get-stuck-at-0-connecting-to-us-archive-ubuntu-com/575130#575130

解决办法内容摘录：

figured out how to get apt-get to work again.

Edit gai.conf:

sudo vim /etc/gai.conf

change line ~54 to uncomment the following:

precedence ::ffff:0:0/96 100

write and quit:

:wq

CAUTION

Look out line 50 which looks almost identical:

precedence ::ffff:0:0/96 10

This is the wrong line. Go ~4 lines down and you‘ll find the correct line to uncomment because it ends with 100 instead of 10

install ros error ：Set up your keys timed out

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原文地址：https://www.cnblogs.com/hiram-zhang/p/9772986.html