Few ubuntu server setup issues and corresponding steps to debug them.

  1. Disabling floppy drive: Error: print_req_error: I/O error, dev fd0, sector 0

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    sudo rmmod floppy
sudo echo "blacklist floppy" | sudo tee /etc/modprobe.d/blacklist-floppy.conf
sudo dpkg-reconfigure initramfs-tools

  2. Error: Network not up: eth/ens doesnt show or no service network-manager

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    sudo dhclient
sudo apt update
sudo apt install network-manager ifupdown
sudo service network-manager restart
sudo systemctl status NetworkManager.service

sudo vi /etc/netplan/01-netcfg.yaml
     # This file describes the network interfaces available on your system
     # For more information, see netplan(5).
     network:
     version: 2
     renderer: NetworkManager
     ethernets:
         ens32:
         dhcp4: yes
sudo netplan generate
sudo netplan apply

  3. ssh setup

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    ## For regenerating only rsa key
sudo ssh-keygen -t rsa -b 4096 -f ssh_host_rsa_key
## For regenerating all missing keys
sudo ssh-keygen
# service ssh restart
sudo systemctl status ssh

  4. Fix non-configured locales

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    sudo locale-gen en_US en_US.UTF-8
sudo dpkg-reconfigure locales