I did not find this topic in my previous search on this forum, nor in the TW site.
Here are my instructions:
Installing TiddlyDesktop on Ubuntu
/home/{user}/TiddlyDesktop
Where {user} is your linux username
Check /home/{user}/TiddlyDesktop/nw has executing permisions: sudo chmod +x nw
Make the following symlink 1):
:~$ sudo ln -s /home/{user}/TiddlyDesktop /usr/bin/nw
And you can run:
:~$ ~/TiddlyDesktop$ ./nw
That's all.
To have TiddlyDesktop on Ubuntu favourite launchbar (optional)
On the terminal (Ctrl-T), do:
:~$ gedit ~/.local/share/applications/TiddlyDesktop.desktop
And paste this text on the editor:
[Desktop Entry]
Type=Application
Encoding=UTF-8
Name=TiddlyDesktop
Comment=TiddlyWiki on your Desktop
Exec=/home/{user}/TiddlyDesktop/nw
Icon=/home/{user}/TiddlyDesktop/images/app_icon.png
Terminal=false
Save and close the editor
Give execution permisions to the file TiddlyDesktop.desktop