Что делает команда «sudo apt-get install upgrade-system»? [дубликат]

Я не знаю, что на самом деле будет делать эта команда, или Нужны ли мне указанные ниже пакеты?

Не удалось найти примеры системы обновления

plutes@plutes-Lenovo-G50-30:~$ sudo apt-get install update
[sudo] password for plutes: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package update
plutes@plutes-Lenovo-G50-30:~$ sudo apt-get install upgrade-system 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  deborphan debsums dialog libfile-fnmatch-perl
The following NEW packages will be installed
  deborphan debsums dialog libfile-fnmatch-perl upgrade-system
0 to upgrade, 5 to newly install, 0 to remove and 0 not to upgrade.
Need to get 382 kB of archives.
After this operation, 1,765 kB of additional disk space will be used.
Do you want to continue? [Y/n] n
Abort.
plutes@plutes-Lenovo-G50-30:~$ sudo apt-get update 
Hit:1 http://security.ubuntu.com/ubuntu disco-security InRelease
Hit:2 http://gb.archive.ubuntu.com/ubuntu disco InRelease
Hit:3 http://gb.archive.ubuntu.com/ubuntu disco-updates InRelease
Hit:4 http://gb.archive.ubuntu.com/ubuntu disco-backports InRelease
Reading package lists... Done
plutes@plutes-Lenovo-G50-30:~$ sudo apt-get upgrade 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
plutes@plutes-Lenovo-G50-30:~$