启动笔记本电脑时，会显示如下消息systemd[1]: Failed to start casper-md5check Verify Live ISO checksums.（取自journalctl -p err）并且\n systemctl status casper-md5check.service显示：
\xc3\x97 casper-md5check.service - casper-md5check Verify Live ISO checksums\n Loaded: loaded (/lib/systemd/system/casper-md5check.service; enabled; vendor preset: enabled)\n Active: failed (Result: exit-code) since Sat 2022-07-30 09:24:42 EEST; 45min ago\n Process: 787 ExecStart=/usr/lib/casper/casper-md5check /cdrom /cdrom/md5sum.txt (code=exited, status=1/FAILURE)\n Main PID: 787 (code=exited, status=1/FAILURE)\n CPU: 3ms\n\niul 30 09:24:42 AcerAspireV5-552G systemd[1]: Starting casper-md5check Verify Live ISO checksums...\niul 30 09:24:42 AcerAspireV5-552G casper-md5check[787]: .fopen md5_file: No such file or directory\niul 30 …boot ×1