ClamAV Antivirus error in Plesk: Failed to start clamd@scan.service: Unit not found.

Samuel Figueredo

Updated January 13, 2026 19:10

Plesk for Linux kb: technical ext: pes

Applicable to:

Unable to install ClamAV via Extensions > Plesk Email Security:

PLESK_ERROR: Execution filemng has failed with exit code 1, stdout: , stderr: Failed to execute operation: No such file or directory
If ClamAV is already installed it cannot be started via Extensions > Plesk Email Security with the following error:

PLESK_ERROR: Execution filemng has failed with exit code 5, stdout: , stderr: Failed to start clamd@scan.service: Unit not found.

Incorrect ClamAV packages are installed when the Atomic repository is enabled on the server:

CONFIG_TEXT: # yum repolist enabled | grep atomic
*atomic: www4.atomicorp.com
atomic/7/x86_64 CentOS / Red Hat Enterprise Linux 7 - atomic 930

Log in to Plesk.
Remove Plesk Email Security extension via Extensions > Plesk Email Security > More > Remove:
Connect to the server via SSH.
Find all the ClamAV packages, for example:

# rpm -qa | grep clam
clamd-0.102.3-13765.el7.art.x86_64
clamav-milter-debuginfo-0.104.3-25721.el8.art.x86_64
clamav-db-0.104.3-25721.el8.art.x86_64

And remove them using the commands below:

# yum remove clamd-0.102.3-13765.el7.art.x86_64
# yum remove clamav-milter-debuginfo-0.104.3-25721.el8.art.x86_64
# yum remove clamav-db-0.104.3-25721.el8.art.x86_64
Disable the Atomic repository:

# yum-config-manager --disable atomic
Reinstall Plesk Email Security under Plesk > Extensions > Plesk Email Security > Get it Free:
Go to Extensions > Plesk Email Security and install all the required components again along with ClamAV.