antivirus definition always up to date?

[f23948]

everyday, it's always shows up to date but it never download definition updates, any suggestions?

Code:

___@___-HP-Compaq-dc7800-Small-Form-Factor:~$ sudo freshclam
[sudo] password for ___:
ERROR: /var/log/clamav/freshclam.log is locked by another process
ERROR: Problem with internal logger (UpdateLogFile = /var/log/clamav/freshclam.log).
___@___-HP-Compaq-dc7800-Small-Form-Factor:~$ sudo rm -rf /var/log/clamav/freshclam.log
___@___-HP-Compaq-dc7800-Small-Form-Factor:~$ sudo freshclam
ClamAV update process started at Thu Feb 23 14:58:17 2017
main.cvd is up to date (version: 57, sigs: 4218790, f-level: 60, builder: amishhammer)
daily.cld is up to date (version: 23117, sigs: 1660426, f-level: 63, builder: neo)
bytecode.cvd is up to date (version: 290, sigs: 55, f-level: 63, builder: neo)
___@___-HP-Compaq-dc7800-Small-Form-Factor:~$