Justmd is a free open source Markdown Editor for linux, Windows and mac OS. Justmd is a electron based markdown editor with simple user interface. It comes with Synchronized scrolling support and UML/flowchart and Tex math support. You can copy and paste HTML content, images and you can also directly copy and paste the text content. It also provides export feature. using this export feature you can export the markdown as HTML and PDF document. The important feature in this editor is live preview mode.
Install Justmd Markdown Editor on ubuntu
Go to above Justmd Markdown Editor download page and download the latest linux build in tar.gz file format . Ex: justmd-linux-x64-v1.1.1.tar.gz. The default download location in ubuntu is Downloads folder. Right click on the downloaded file and select extract here. This will unzip the file. Open the extracted folder and right click on justmd program file and select properties. In the properties window select the permissions tab and check Allow executing files as program option. and close that window.
Now double click that file to run the Justmd Markdown Editor on ubuntu.