A Note on Ubuntu Dash Icons

In principle, dash application icons are located under /usr/share/icons/hicolor/apps, however, this can be customized. For instance, the configuration for a program named ScicosLab lies in /usr/share/applications/scicoslab.desktop, it has the following content:

[Desktop Entry]
Name=ScicosLab
Comment=Scientific Computing using ScicosLab
TryExec=/usr/bin/scicoslab
Exec=/usr/bin/scicoslab
Icon=/usr/lib/scicoslab-gtk-4.4.1/config/puffin-gtk48.png
Terminal=false
Type=Application
Categories=Education;Science;Math;
StartupNotify=false
X-Desktop-File-Install-Version=0.15

One can restart the system to see the effect.

To regenerate the cache

sudo gtk-update-icon-cache --force /usr/share/icons/hicolor