Not able to view the UI changes made in code of Ui related files unless it is changed in dist_source folder app.js and app.css

[SowjanyaPukkalla]

I Installed it in ubuntu but it only got installed and ran by using ./Install.sh. Faced so many errors for ./ubuntu_install.sh.
And after changing code in ui files its output is not reflected in the UI.
The UI only changed after changing dist_source folder app.js & app.css.
How to fix this? where am i doing wrong? any installation mistakes or do i need to do something else to work in UI related files to show output. @LiChengxin007 @zhishufei @xinxiangshichengddd @mattheliu @wangshiyouyang @thudeng