try to change this
/etc/systemd/system/multi-user.target.wants/snmpd.service
change string
ExecStart=/usr/sbin/snmpd -Lsd -Lf /dev/null -u Debian-snmp -g Debian-snmp -I -smux,mteTrigger,mteTriggerConf -f -p /run/
snmpd.pidon
ExecStart=/usr/sbin/snmpd -Lsd -Lf /dev/null -u Debian-snmp -g Debian-snmp -I -smux, -I -interface -I -ipAddressTable -I -ifTable -I-ifXTable -I-var_route, -I -ipCidrRouteTable, -I -inetCidrRouteTable -f -p /run/
snmpd.pidthen
systemctl daemon-reload
systemctl restart snmpd.service