How to pin icons to the taskbar in Ubuntu 18.04

Open the terminal and enter application management cd ~/.local/share/applications/
Create a new application icon vim ***.desktop (for example: wechat.desktop)

#!/usr/bin/env xdg-open
[Desktop Entry]
Version=1.0
Terminal=false
Type=Application
Name=
Exec=
Icon=
NoDisplay=false
StartupWMClass=

Exec represents the application startup path, Icon represents the icon path

Then click the Apply button and drag the newly generated application icon to the taskbar

At this time, when StartupWMClass is empty, double icons will appear when starting the application

To solve this problem, first open the application and then enter in the terminal:

xprop |grep WM_CLASS, at this time the mouse pointer will turn into a crosshair, then click on the open application, the terminal will feedback a message, including 2 strings

Add the contents of the first string to StartupWMClass, save it, close the application and reopen it, and the double icon will no longer appear

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