DO Agent failing with `error code 100`

/opt/digitalocean/droplet-agent/scripts/update.sh と、issue に示されている /var/log/droplet-agent.update.log の出力から始めます。影響を受けるホストでの apt lock failure に関する更新パスを再現または調査します。ロックの原因と期待される更新動作が明らかになれば完了です。

This is a tracking issue, some logs:

coffee@buildbot:~$ cat /var/log/droplet-agent.update.log
Waiting 799 seconds
Checking architecture support...OK
Preparing to check for update
Package Host: https://repos-droplet.digitalocean.com
Package Path: apt/droplet-agent/pool/main/main/d/droplet-agent/droplet-agent_
Keyring Path: apt/droplet-agent/pool/main/main/d/droplet-agent-keyring/droplet-agent-keyring_
Local Keyring:2.0.0
Local Version:1.2.11
Checking Latest Version...
Latest keyring package:2.0.0
Latest agent package:1.2.1
Updating droplet-agent deb package
E: Could not get lock /var/lib/apt/lists/lock. It is held by process 1708639 (apt-get)
E: Unable to lock directory /var/lib/apt/lists/

the logs do exist, are empty, but eventaully go away:

coffee@buildbot:~$ sudo /opt/digitalocean/droplet-agent/scripts/update.sh
Waiting 465 seconds
Checking architecture support...OK
Preparing to check for update
Package Host: https://repos-droplet.digitalocean.com
Package Path: apt/droplet-agent/pool/main/main/d/droplet-agent/droplet-agent_
Keyring Path: apt/droplet-agent/pool/main/main/d/droplet-agent-keyring/droplet-agent-keyring_
Local Keyring:2.0.0
Local Version:1.2.11
Checking Latest Version...
Latest keyring package:2.0.0
Latest agent package:1.2.1
Updating droplet-agent deb package
coffee@buildbot:~$ echo $?
0
coffee@buildbot:~$ cat /var/log/droplet-agent.update.log
Waiting 493 seconds
Checking architecture support...OK
Preparing to check for update
Package Host: https://repos-droplet.digitalocean.com
Package Path: apt/droplet-agent/pool/main/main/d/droplet-agent/droplet-agent_
Keyring Path: apt/droplet-agent/pool/main/main/d/droplet-agent-keyring/droplet-agent-keyring_
Local Keyring:2.0.0
Local Version:1.2.11
Checking Latest Version...
Latest keyring package:2.0.0
Latest agent package:1.2.1
Updating droplet-agent deb package

so i'm not really sure yet what's causing the locks across many hosts 🙃

https://costinstefan.ro/post/2020-02-16-how-to-fix-do-agent-exited/
https://www.digitalocean.com/community/questions/do-agent-exited-with-a-return-code-100