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编辑1

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编辑1

启动笔记本电脑时，会出现如下消息systemd[1]: Failed to start casper-md5check Verify Live ISO checksums.（取自 journalctl -p err），并且 systemctl status casper-md5check.service显示：

× casper-md5check.service - casper-md5check Verify Live ISO checksums
     Loaded: loaded (/lib/systemd/system/casper-md5check.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Sat 2022-07-30 09:24:42 EEST; 45min ago
    Process: 787 ExecStart=/usr/lib/casper/casper-md5check /cdrom /cdrom/md5sum.txt (code=exited, status=1/FAILURE)
   Main PID: 787 (code=exited, status=1/FAILURE)
        CPU: 3ms

iul 30 09:24:42 AcerAspireV5-552G systemd[1]: Starting casper-md5check Verify Live ISO checksums...
iul 30 09:24:42 AcerAspireV5-552G casper-md5check[787]: .fopen md5_file: No such file or directory
iul 30 09:24:42 AcerAspireV5-552G casper-md5check[787]: Checking integrity, this may take some time (or try: fsck.mode=skip)
iul 30 09:24:42 AcerAspireV5-552G systemd[1]: casper-md5check.service: Main process exited, code=exited, status=1/FAILURE
iul 30 09:24:42 AcerAspireV5-552G systemd[1]: casper-md5check.service: Failed with result 'exit-code'.
iul 30 09:24:42 AcerAspireV5-552G systemd[1]: Failed to start casper-md5check Verify Live ISO checksums.

我尝试跑步sudo /usr/lib/casper/casper-md5check /cdrom /cdrom/md5sum.txt我得到以下结果：

.
Checking integrity, this may take some time (or try: fsck.mode=skip)
fopen md5_file: No such file or directory

错误代码为 1。

编辑1

我通过运行 禁用了它的启动sudo systemctl disable casper-md5check.service。但这并不能解释问题的出现方式。

编辑2

的内容/etc/lsb-发布

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_CODENAME=jammy
DISTRIB_DESCRIPTION="Linux Lite 6.0"

答案1

运行systemctl --failedlikely 会产生类似以下内容的输出，从而引导您进入此站点：

UNIT                    LOAD   ACTIVE SUB    DESCRIPTION            
● casper-md5check.service masked failed failed casper-md5check.service

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.
1 loaded units listed.

这似乎是一个非严重的错误，它是在 Ubuntu 22.04（Jammy）存储库的 Linux Mint 21（Vanessa）世界中发现的。

$ lsb_release -a

Distributor ID: Linuxmint
Description:    Linux Mint 21
Release:    21
Codename:   vanessa

运行apt-cache show casper显示输出：

Origin: Ubuntu
Filename: pool/main/c/casper/casper_1.470_amd64.deb
Description-en: Run a "live" preinstalled system from read-only media
Description-md5: 9be0120948307c7e897a16c45a69ba0f
Tag: admin::boot, admin::filesystem, implemented-in::shell, protocol::smb,  role::plugin, scope::utility, special::completely-tagged, works-with-    format::iso9660
Task: xubuntu-live

这表明它来自 Ubuntu 主存储库。根据 pkg 描述和从 github 存储库文件收集的信息casper-md5check.c如果你不参与任何与 live-boot 安装相关的操作，完全删除它似乎是安全的。我使用以下命令删除了 casper 包sudo apt remove casper -y

$ systemctl status casper-md5check显示该服务已被屏蔽：

× casper-md5check.service
Loaded: masked (Reason: Unit casper-md5check.service is masked.)
Active: failed (Result: exit-code) since Mon 2022-09-26 23:25:24 PDT; 7min ago
Main PID: 989 (code=exited, status=1/FAILURE)
CPU: 1ms

Sep 26 23:25:24 LT-MINT2 systemd[1]: Starting casper-md5check Verify Live ISO checksums...
Sep 26 23:25:24 LT-MINT2 casper-md5check[989]: .fopen md5_file: No such file or directory
Sep 26 23:25:24 LT-MINT2 casper-md5check[989]: Checking integrity, this may take some time (or try: fsck.mode=skip)
Sep 26 23:25:24 LT-MINT2 systemd[1]: casper-md5check.service: Main process exited, code=exited, status=1/FAILURE
Sep 26 23:25:24 LT-MINT2 systemd[1]: casper-md5check.service: Failed with result 'exit-code'.
Sep 26 23:25:24 LT-MINT2 systemd[1]: Failed to start casper-md5check Verify Live ISO checksums.

取消屏蔽服务会sudo systemctl unmask casper-md5check自动删除位于 /etc/systemd/system/casper-md5check.service 的服务单元文件。

但是，通过搜索“casper*”还会发现几个可以删除的与 casper 相关的文件：

$ sudo rm /etc/systemd/system/casper.service
$ sudo rm /etc/systemd/system/multi-user.target.wants/casper-md5check.service
$ sudo rm /etc/systemd/system/final.target.wants/casper.service

然后您可以执行sudo systemctl daemon-reload和sudo systemctl reset-failed以重置故障。

$ systemctl --failed

单位负载活动子描述列出了 0 个负载单位。

$ sudo systemctl is-system-running

跑步

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