root@MaCoGa:~# apt install screen
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  libutempter0
Suggested packages:
  byobu | screenie | iselect
The following NEW packages will be installed:
  libutempter0 screen
0 upgraded, 2 newly installed, 0 to remove and 28 not upgraded.
Need to get 581 kB of archives.
After this operation, 1,052 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://us.archive.ubuntu.com/ubuntu cosmic/main amd64 libutempter0 amd64 1                                                                             .1.6-3 [7,898 B]
Err:2 http://us.archive.ubuntu.com/ubuntu cosmic/main amd64 screen amd64 4.6.2-3
  404  Not Found [IP: 91.189.91.38 80]
Fetched 7,898 B in 0s (28.4 kB/s)
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/s/screen/screen                                                                             _4.6.2-3_amd64.deb  404  Not Found [IP: 91.189.91.38 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-mis                                                                             sing?
root@MaCoGa:~#