症状：Ubuntuでネットワークに接続できない

解決方法：時刻を合わせる

やり方：

・現状確認

mma@mma-B760-DS3H-DDR4:/etc$ timedatectl

• Local time: 木 2023-05-25 11:07:53 JST

• Universal time: 木 2023-05-25 02:07:53 UTC
  • RTC time: 木 2023-05-25 02:07:53
  • Time zone: Asia/Tokyo (JST, +0900)

System clock synchronized: no

• NTP service: active

• RTC in local TZ: no

mma@mma-B760-DS3H-DDR4:/etc$ sudo systemctl status systemd-timesyncd.service [sudo] password for mma: ● systemd-timesyncd.service - Network Time Synchronization

• Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; ve> Active: active (running) since Thu 2023-05-25 11:00:24 JST; 8min ago

  • Docs: man:systemd-timesyncd.service(8)

• Main PID: 603 (systemd-timesyn)
  • Status: "Idle."
    • Tasks: 2 (limit: 38237)
    Memory: 1.4M
    • CPU: 44ms
    CGroup: /system.slice/systemd-timesyncd.service
    • └─603 /lib/systemd/systemd-timesyncd

• 5月 25 11:02:49 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f> 5月 25 11:02:59 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f> 5月 25 11:03:09 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f> 5月 25 11:04:24 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f> 5月 25 11:04:34 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f> 5月 25 11:06:52 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f> 5月 25 11:07:03 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f> 5月 25 11:07:13 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f> 5月 25 11:07:23 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f> 5月 25 11:07:33 mma-B760-DS3H-DDR4 systemd-timesyncd[603]: Timed out waiting f>

lines 1-22/22 (END)...skipping...

・ntpの設定追加

mma@mma-B760-DS3H-DDR4:/etc$ sudo nano /etc/systemd/timesyncd.conf

-変更点

#NTP=　→　NTP=sunrise.mma.club.uec.ac.jp

・リスタート

mma@mma-B760-DS3H-DDR4:/etc$ sudo systemctl restart systemd-timesyncd.service

・最後に確認

mma@mma-B760-DS3H-DDR4:/etc$ sudo systemctl status systemd-timesyncd.service ● systemd-timesyncd.service - Network Time Synchronization

• Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; ve> Active: active (running) since Thu 2023-05-25 11:15:33 JST; 17h left

  • Docs: man:systemd-timesyncd.service(8)

• Main PID: 4698 (systemd-timesyn)

  • Status: "Initial synchronization to time server 192.168.1.254:123 (sunrise>

    • Tasks: 2 (limit: 38237)
    Memory: 1.3M
    • CPU: 41ms
    CGroup: /system.slice/systemd-timesyncd.service
    • └─4698 /lib/systemd/systemd-timesyncd

• 5月 25 11:15:33 mma-B760-DS3H-DDR4 systemd[1]: Starting Network Time Synchroni> 5月 25 11:15:33 mma-B760-DS3H-DDR4 systemd[1]: Started Network Time Synchroniz> 5月 24 17:15:38 mma-B760-DS3H-DDR4 systemd-timesyncd[4698]: Initial synchroniz>

終了