我有一个带有多个用户的 Ubuntu 20.04.4 工作站，并且我希望无论是否有人登录，时间移位都能每天运行。我今天检查了系统，发现时间移位一直失败并在日志文件中报告以下错误：
<<< snip >>>
[14:00:01] Main: load_app_config()
[14:00:01] IconManager: init()
[14:00:01] bin_path: /bin/tiubuntumeshift
[14:00:01] found images directory: /usr/share/timeshift/images
[14:00:01] base_path: (null)
[14:00:01] Main(): ok
[14:00:01] AppConsole: parse_arguments()
[14:00:01] Main: initialize_repo()
[14:00:01] backup_uuid=784c8ccd-c74b-4e9d-be70-e3a9faf81818
[14:00:01] backup_parent_uuid=
[14:00:01] Setting snapshot device from config file
[14:00:01] Main: initialize_repo(): exit
[14:00:01] AppConsole: start_application()
[14:00:01]
[14:00:01] Snapshot device not available
[14:00:01] Device not found: UUID='784c8ccd-c74b-4e9d-be70-e3a9faf81818'
[14:00:01] exit_app()
[14:00:01] crontab -l
[14:00:01] Failed to read cron tab
[14:00:01] crontab -l
[14:00:01] Failed to read cron tab
[14:00:01] Cron task exists: /etc/cron.d/timeshift-hourly
[14:00:01] unmount_target_device()
[14:00:01] clean_logs()
[14:00:01] rm -rf '/tmp/Sst3u[14:00:01] Main: load_app_config()
[14:00:01] IconManager: init()
[14:00:01] bin_path: /bin/timeshift
[14:00:01] found images directory: /usr/share/timeshift/images
[14:00:01] base_path: (null)
[14:00:01] Main(): ok
[14:00:01] AppConsole: parse_arguments()
[14:00:01] Main: initialize_repo()
[14:00:01] backup_uuid=784c8ccd-c74b-4e9d-be70-e3a9faf81818
[14:00:01] backup_parent_uuid=
[14:00:01] Setting snapshot device from config file
[14:00:01] Main: initialize_repo(): exit
[14:00:01] AppConsole: start_application()
[14:00:01]
[14:00:01] Snapshot device not available
[14:00:01] Device not found: UUID='784c8ccd-c74b-4e9d-be70-e3a9faf81818'
[14:00:01] exit_app()
[14:00:01] crontab -l
[14:00:01] Failed to read cron tab
[14:00:01] crontab -l
[14:00:01] Failed to read cron tab
[14:00:01] Cron task exists: /etc/cron.d/timeshift-hourly
[14:00:01] unmount_target_device()
[14:00:01] clean_logs()
[14:00:01] rm -rf '/tmp/Sst3u9bB'9bB'
当我“按需”运行 timeshift 时，我成功了。日志文件如下所示...
<<< snip >>>
[11:47:41] Main: load_app_config()
[11:47:41] App config loaded: /etc/timeshift.json
[11:47:41] IconManager: init()automatically
[11:47:41] bin_path: /usr/bin/timeshift-gtk
[11:47:41] found images directory: /usr/share/timeshift/images
[11:47:41] Main(): ok
[11:47:41] Main: initialize_repo()
[11:47:41] backup_uuid=784c8ccd-c74b-4e9d-be70-e3a9faf81818
[11:47:41] backup_parent_uuid=
[11:47:41] Setting snapshot device from config file
[11:47:41] repo: creating from uuid
[11:47:41] SnapshotRepo: from_uuid(): RSYNC
[11:47:41] uuid=784c8ccd-c74b-4e9d-be70-e3a9faf81818
[11:47:41] SnapshotRepo: init_from_device()
<<< snip >>>
请注意，backup_UUID 是相同的。在我看来，这似乎是权限错误。备份驱动器上 timeshift 文件夹的权限为：
drwxr-xr-x 9 root root 4096 Jun 27 11:50 timeshift
我宁愿不将备份驱动器的 CHMOD 权限设置为允许所有人写入。相反，我希望在未登录时允许时间移位以适当的权限成功运行。
或者，也许这根本不是一个权限问题——我只使用 Linux 大约一年，但仍然对某些事情感到困惑。
顺便说一句，当我登录并“按需”运行 timeshift（并且它可以工作）时，我没有以 root 身份登录。我以与以下组关联的用户身份登录：
<user> adm cdrom sudo dip plugdev lpadmin sambashare HGS
针对以下评论，结果如下sudo lsblk -f：
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT
loop0 squashfs 0 100% /snap/core/13250
loop1 squashfs 0 100% /snap/core/13308
loop2 squashfs 0 100% /snap/notepadqq/855
sda
└─sda1 ext4 5deaeefe-94e6-4f95-bf29-a0794c563de9 993.7G 38% /data
sdb
└─sdb1 ext4 784c8ccd-c74b-4e9d-be70-e3a9faf81818 3.1T 26% /run/timeshift/backup
nvme0n1
├─nvme0n1p1 vfat 3747-AF41 505.8M 1% /boot/efi
└─nvme0n1p2 ext4 0806f74e-4c9b-4733-93b0-4a6f2404c261 163.4G 86% /
任何意见，将不胜感激。