این هم خروجی تک تک دستوراتی که خواسته بودی:
# apt update
Hit:1 http://archive.ubuntu.com/ubuntu cosmic InRelease
Get:2 http://archive.ubuntu.com/ubuntu cosmic-updates InRelease [88.7 kB]
Hit:3 http://archive.ubuntu.com/ubuntu cosmic-backports InRelease
Hit:4 http://archive.ubuntu.com/ubuntu cosmic-security InRelease
Fetched 88.7 kB in 2s (54.9 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
4 packages can be upgraded. Run 'apt list --upgradable' to see them.
# apt dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
libboost-chrono-dev libboost-python-dev libboost-random-dev libboost-system-dev
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
# apt install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
# cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 18.04.1 LTS _Bionic Beaver_ - Release amd64 (20180725)]/ bionic main restricted
deb-src http://archive.ubuntu.com/ubuntu cosmic main restricted #Added by software-properties
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu cosmic main restricted
deb-src http://archive.ubuntu.com/ubuntu cosmic universe multiverse
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu cosmic-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu cosmic-updates universe main multiverse restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu cosmic universe
# deb-src http://ir.archive.ubuntu.com/ubuntu/ bionic universe
deb http://archive.ubuntu.com/ubuntu cosmic-updates universe
# deb-src http://ir.archive.ubuntu.com/ubuntu/ bionic-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu cosmic multiverse
# deb-src http://ir.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://archive.ubuntu.com/ubuntu cosmic-updates multiverse
# deb-src http://ir.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu cosmic-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu cosmic-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu bionic partner
# deb-src http://archive.canonical.com/ubuntu bionic partner
deb http://archive.ubuntu.com/ubuntu cosmic-security main restricted
deb-src http://archive.ubuntu.com/ubuntu cosmic-security universe main multiverse restricted
deb http://archive.ubuntu.com/ubuntu cosmic-security universe
# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://archive.ubuntu.com/ubuntu cosmic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse
راستی چرا نباید از sudo su استفاده کرد؟
ممنون
علیرضا