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Ubuntu apt update error: “Release file is not yet valid”
服务器上执行 sudo apt update 检查更新，返回错误如下：
Hit:1 ubuntu bionic InRelease Ign:3 linux/chrome/deb stable InRelease
Get:2 /ubuntu bionic-updates InRelease [88.7 kB]
Get:5 /linux/chrome/deb stable Release [943 B]
Get:6 http://dl.google.com/linux/chrome/deb stable Release.gpg [819 B]
Get:4 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB] Get:7 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB]
Reading package lists... Done
E: Release file for http://dl.google.com/linux/chrome/deb/dists/stable/Release is not valid yet (invalid for another 2h 45min 28s). Updates for this repository will not be applied. E: Release file for http://us.archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease is not valid yet (invalid for another 4h 34min 33s). Updates for this repository will not be applied. E: Release file for http://us.archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease is not valid yet (invalid for another 1h 22min 16s). Updates for this repository will not be applied. E: Release file for http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease is not valid yet (invalid for another 4h 32min 36s).
到 AskUbuntu 上找到解决方案，说是系统时间不对，需要同步下时间。执行命令
$ sudo hwclock --hctosys
再次执行 sudo apt update 后正常。
查看当前时区设置
$ cat /etc/timezone
America/Los_Angeles
修改时区为 Asia/Shanghai
$ sudo dpkg-reconfigure tzdata
查看当前时间同步设置：
$ timedatectl
Local time: Tue 2021-06-15 21:33:12 CST
Universal time: Tue 2021-06-15 13:33:12 UTC
RTC time: Tue 2021-06-15 13:33:13
Time zone: Asia/Shanghai (CST, +0800)
System clock synchronized: no
systemd-timesyncd.service active: yes
RTC in local TZ: no
可以看出时钟同步服务已经开启了(systemd-timesyncd.service active: yes)，但是时钟却没能同步(System clock synchronized: no) 查看下同步服务的状态：
$ sudo systemctl status systemd-timesyncd.service
● systemd-timesyncd.service - Network Time Synchronization
Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2021-06-15 21:29:37 CST; 16s ago
Docs: man:systemd-timesyncd.service(8)
Main PID: 31177 (systemd-timesyn)
Status: "Connecting to time server 91.189.89.198:123 (ntp.ubuntu.com)."
Tasks: 2 (limit: 4680)
CGroup: /system.slice/systemd-timesyncd.service
└─31177 /lib/systemd/systemd-timesyncd
可以看到错误 Connecting to time server 91.189.89.198:123 (ntp.ubuntu.com)。使用 ntpd 替代 timesyncd。
$ sudo timedatectl set-ntp no
$ timedatectl
Local time: Tue 2021-06-15 21:37:38 CST
Universal time: Tue 2021-06-15 13:37:38 UTC
RTC time: Tue 2021-06-15 13:37:38
Time zone: Asia/Shanghai (CST, +0800)
System clock synchronized: no
systemd-timesyncd.service active: no
RTC in local TZ: no
$ sudo apt install ntp
$ ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
0.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000
1.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000
2.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000
3.ubuntu.pool.n .POOL. 16 p - 64 0 0.000 0.000 0.000
ntp.ubuntu.com .POOL. 16 p - 64 0 0.000 0.000 0.000
$ timedatectl
Local time: Tue 2021-06-15 21:38:12 CST
Universal time: Tue 2021-06-15 13:38:12 UTC
RTC time: Tue 2021-06-15 13:38:13
Time zone: Asia/Shanghai (CST, +0800)
System clock synchronized: yes
systemd-timesyncd.service active: no
RTC in local TZ: no
可以看到时间已经同步成功(System clock synchronized: yes)。