Add user filtering with AllowUsers option in sshd_config file:
AllowUsers johndoe@192.168.1.* admin2@192.168.1.* otherid1 otherid2
This allows johndoe and admin2 only from 192.168.1.* addresses and otherid1, otherid2 from anywhere.
sudo fuser -vik -TERM /var/lib/apt/lists/lock