unable to locate package

I don't know if this is specific to Kali Linux Live or Linux in general, so I'm posting here while still waiting for a moderator to approve my post in the Kali forum. I just installed Kali Linux Live (4GB and also tried the everything 12GB) iso onto a USB drive. I can boot into Kali with no...

root@KaliOS:~# apt install tilix Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package tilix root@KaliOS:~# apt install GtkD Reading package lists... Done Building dependency tree Reading state information... Done E...