sudo apt-get install openssh-server 


http://c-nergy.be/blog/?p=5305

====== swap ======

  sudo fallocate -l 2G /swapfile
  sudo dd if=/dev/zero of=/swapfile bs=1024 count=2097152
  sudo chmod 600 /swapfile
  sudo mkswap /swapfile
  sudo swapon /swapfile
  sudo nano /etc/fstab
  /swapfile swap swap defaults 0 0
  sudo swapon --show

====== xrdp ======


sudo apt-get update

sudo apt-get install xrdp

sudo apt-get install xfce

echo xfce4-session >~/.xsession

sudo service xrdp restart

====== Timezone ======

dpkg-reconfigure tzdata


======  enable unattended upgrades ======

sudo dpkg-reconfigure unattended-upgrades

====== remove old kernels ======

http://ubuntuhandbook.org/index.php/2016/05/remove-old-kernels-ubuntu-16-04/


====== network wait 5min's=====

In my case, that looks like:

Code:

#Original Line\\
 auto ens34\\
 iface ens34 inet dhcp\\

 #New line\\
 allow-hotplug ens34\\
 iface ens34 inet dhcp\\




[[ubuntu_updates]]

https://www.howtoforge.com/tutorial/how-to-setup-automatic-security-updates-on-ubuntu-1604/


====== Switch manager ubuntu ======

===== switch manager for Python =====


  * Step1

  ls /usr/bin/python*
  /usr/bin/python2  /usr/bin/python2.7  /usr/bin/python3  /usr/bin/python3.7  /usr/bin/python3.7m  
  /usr/bin/python3.8  /usr/bin/python3-futurize  /usr/bin/python3m  /usr/bin/python3-pasteurize

  * Step2

  sudo update-alternatives --list python
  update-alternatives: error: no alternatives for python

  * Step3

  sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 2
  sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 1

  * Step4

  sudo update-alternatives --list python
  /usr/bin/python2
  /usr/bin/python3

  * Step5

  sudo update-alternatives --config python
  There are 2 choices for the alternative python (providing /usr/bin/python).
  
    Selection    Path              Priority   Status
  ------------------------------------------------------------
  * 0            /usr/bin/python3   2         auto mode
    1            /usr/bin/python2   1         manual mode
    2            /usr/bin/python3   2         manual mode
  
  Press  to keep the current choice[*], or type selection number: 1

===== python is python3 =====

apt install python-is-python3


===== custom DNS on Ubuntu 14.04 =====

  sudo nano /etc/resolvconf/resolv.conf.d/base
  nameserver 8.8.8.8
  nameserver 8.8.4.4
  sudo resolvconf -u

===== Configure DNS under loopback =====

  auto lo
  iface lo inet loopback
  dns-nameservers 8.8.8.8 8.8.8.4

===== netplan =====

  * dhcp

  network:
    version: 2
    renderer: networkd
    ethernets:
      enp3s0:
        dhcp4: true

  * static

  network:
    version: 2
    renderer: networkd
    ethernets:
      enp3s0:
        addresses:
          - 10.10.10.2/24
        gateway4: 10.10.10.1
        nameservers:
            search: [mydomain, otherdomain]
            addresses: [10.10.10.1, 1.1.1.1]
            

  * brdige interface

  network:
    version: 2
    renderer: networkd
    ethernets:
      ens160:
        dhcp4: true
    ethernets:
      ens192:
        dhcp4: false
        dhcp6: false
    bridges:
      lxcbr1:
        interfaces: [ens192]
        mtu: 1500
        dhcp4: false
        dhcp6: false