---------------------------
PuTTY Security Alert
---------------------------
WARNING - POTENTIAL SECURITY BREACH!

The server's host key does not match the one PuTTY has
cached in the registry. This means that either the
server administrator has changed the host key, or you
have actually connected to another computer pretending
to be the server.
The new ssh-ed25519 key fingerprint is:
ssh-ed25519 255 e2:87:28:31:15:b6:62:b5:a4:24:23:36:a5:74:fe:62
If you were expecting this change and trust the new key,
hit Yes to update PuTTY's cache and continue connecting.
If you want to carry on connecting but without updating
the cache, hit No.
If you want to abandon the connection completely, hit
Cancel. Hitting Cancel is the ONLY guaranteed safe
choice.

---------------------------
Yes   No   Cancel   Help   
---------------------------

Welcome to Ubuntu 16.04.1 LTS (GNU/Linux 4.4.0-31-generic x86_64)

 * Documentation:  [IMG alt=" وصف الصورة "]https://help.ubuntu.com
 * Management:     [IMG alt=" وصف الصورة "]https://landscape.canonical.com
 * Support:        [IMG alt=" وصف الصورة "]https://ubuntu.com/advantage

249 packages can be updated.
169 updates are security updates.


root@vps5260:~#

passwd

Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
root@vps5260:~#

cat /etc/hostname

root@vps5260:~# cat /etc/hostname
vps5260.first-root.com

hostnamectl set-hostname maanaa.net

cat /etc/hostname

root@vps5260:~# cat /etc/hostname
maanaa.net
root@vps5260:~#

reboot

sudo lsb_release -a

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.1 LTS
Release:        16.04
Codename:       xenial
root@maanaa:~#

sudo apt-get full-upgrade

reboot

do-release-upgrade -f DistUpgradeViewNonInteractive

reboot

Using username "root".
Welcome to Ubuntu 18.04.5 LTS (GNU/Linux 4.15.0-132-generic x86_64)

 * Documentation:  [IMG alt=" وصف الصورة "]https://help.ubuntu.com
 * Management:     [IMG alt=" وصف الصورة "]https://landscape.canonical.com
 * Support:        [IMG alt=" وصف الصورة "]https://ubuntu.com/advantage

  System information as of Thu Jan 14 23:07:00 CET 2021

  System load:  0.41              Processes:           84
  Usage of /:   6.6% of 37.08GB   Users logged in:     0
  Memory usage: 11%               IP address for ens3: 193.25.100.138
  Swap usage:   0%

0 packages can be updated.
0 of these updates are security updates.


root@maanaa:~#