Please answer the following

If it is a terminal issue then please go through wiki
https://github.com/PowerShell/Win32-OpenSSH/wiki/TTY-PTY-support-in-Windows-OpenSSH

I checked this document and it does not appear to discuss my problem. I did try with the environment variable TERM = 'xterm' but this had no effect. However I belive that the problem is in the keyboard support.

"OpenSSH for Windows" version
((Get-Item (Get-Command sshd).Source).VersionInfo.FileVersion)
0.0.18.0

Server OperatingSystem
((Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows nt\CurrentVersion\" -Name ProductName).ProductName)
Ubuntu 16.04.3 Server

Client OperatingSystem
Windows 10 Pro Version 1709.
Note that the Windows system has a Spanish language keyboard and is configured to use it.

What is failing
After logging into Linux using password authentication I run the following command which requires me to enter my password at the console:

sudo ufw status
Expected output
The command runs.

Actual output

wobadmin@Throwawau:~$ sudo ufw status
[sudo] password for wobadmin:
Sorry, try again.
[sudo] password for wobadmin:
Sorry, try again.
[sudo] password for wobadmin:
sudo: 3 incorrect password attempts
wobadmin@Throwawau:~$

Note that any command using sudo will do.

I was using the character # in my password and I discovered if I changed the password to contain alphanumeric characters only, I was able to use sudo without problems. Note that on a Spanish language keyboard the # character can only be entered in combination with the AltGr key and is the third character on the 3 key.

Also note that I can type the # key on the command line without problem. It is only when entering a password that the problem occurs.

Apologies for the typo that caused the issue to appear prematurely.