The command is systemctl (lower case L) (short for “system control”), you have typed systemct1 (the number 1).
Anyway, seems like a distribution issue. NetworkManager should be running by default, and if it’s not then either your distributor or your sysadmin have misconfigured something. Either way, questions about this are probably best suited for your distro
Thank you I am sure I tried that also. The problem I was having the person who told that his computer typed a “l” I could not on my computer find that so I tried i, 1 and a lower case L. Anyway I am sure you are correct. I copied over my os and because I can’t get on the internet I can’t re down load a new version. Any ideas?