Hello till, On my Debian 11, I found everything is normal except clamav-daemon.service can't be started. I uninstalled and installed clamav and clamav-daemon many times but no one was successful. Could you tell my how to let clamav-daemon.service running? My server's IP: 22.214.171.124 I run the test script and I share you output in a code block. Thanks. Code: ##### SCRIPT FINISHED ##### Results can be found in htf_report.txt To view results use your favourite text editor or type 'cat htf_report.txt | more' on the server console. If you want to see the non-anonymized output start the script with --debug as parameter (php -q htf-common-issues.php --debug). root@less:~# cat htf_report.txt | more ##### SERVER ##### IP-address (as per hostname): [localhost] [WARN] could not determine server's ip address by ifconfig [INFO] OS version is Debian GNU/Linux 11 (bullseye) [INFO] uptime: 07:13:40 up 40 days, 18:21, 2 users, load average: 0.02, 0.06, 0.06 [INFO] memory: total used free shared buff/cache available Mem: 990Mi 286Mi 85Mi 107Mi 619Mi 449Mi Swap: 520Mi 230Mi 290Mi [INFO] systemd failed services status: UNIT LOAD ACTIVE SUB DESCRIPTION ● clamav-daemon.service loaded failed failed Clam AntiVirus userspace daemon ● clamav-freshclam.service loaded failed failed ClamAV virus database updater 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. 2 loaded units listed.