I did a fresh install, changed mirror URL during process and sources.list now looks as below.
patrik@miab:~$ cat /etc/apt/sources.list
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu bionic main restricted
# deb-src http://archive.ubuntu.com/ubuntu bionic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu bionic-updates main restricted
# deb-src http://archive.ubuntu.com/ubuntu bionic-updates main 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 bionic universe
# deb-src http://archive.ubuntu.com/ubuntu bionic universe
deb http://archive.ubuntu.com/ubuntu bionic-updates universe
# deb-src http://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 bionic multiverse
# deb-src http://archive.ubuntu.com/ubuntu bionic multiverse
deb http://archive.ubuntu.com/ubuntu bionic-updates multiverse
# deb-src http://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 bionic-backports main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu bionic-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 bionic-security main restricted
# deb-src http://archive.ubuntu.com/ubuntu bionic-security main restricted
deb http://archive.ubuntu.com/ubuntu bionic-security universe
# deb-src http://archive.ubuntu.com/ubuntu bionic-security universe
deb http://archive.ubuntu.com/ubuntu bionic-security multiverse
# deb-src http://archive.ubuntu.com/ubuntu bionic-security multiverse
Fais in the same fashion:
Installing nsd (DNS server)...
FAILED: apt-get -y -o Dpkg::Options::=--force-confdef -o Dpkg::Options::=--force-confnew install nsd ldnsutils openssh-client
-----------------------------------------
Reading package lists...
Building dependency tree...
Reading state information...
openssh-client is already the newest version (1:7.6p1-4ubuntu0.7).
The following NEW packages will be installed:
ldnsutils libldns2 nsd
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 1,010 kB of archives.
After this operation, 3,155 kB of additional disk space will be used.
Err:1 http://archive.ubuntu.com/ubuntu bionic/universe amd64 nsd amd64 4.1.17-1build1
Temporary failure resolving 'archive.ubuntu.com'
Ign:2 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libldns2 amd64 1.7.0-3ubuntu4.1
Ign:3 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 ldnsutils amd64 1.7.0-3ubuntu4.1
Err:2 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libldns2 amd64 1.7.0-3ubuntu4.1
Temporary failure resolving 'archive.ubuntu.com'
Err:3 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 ldnsutils amd64 1.7.0-3ubuntu4.1
Temporary failure resolving 'archive.ubuntu.com'
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/universe/n/nsd/nsd_4.1.17-1build1_amd64.deb Temporary failure resolving 'archive.ubuntu.com'
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/l/ldns/libldns2_1.7.0-3ubuntu4.1_amd64.deb Temporary failure resolving 'archive.ubuntu.com'
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/universe/l/ldns/ldnsutils_1.7.0-3ubuntu4.1_amd64.deb Temporary failure resolving 'archive.ubuntu.com'
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Need more ideas. 
Thanks