After install Qgis with Miniconda in home system, you can create the launcher to Qgis2 in order to run it in Ubuntu without open terminal.
1º) Create file Qgis2.desktop in your desktop
cd /Desktop
touch Qgis2.desktop
2º) Open it and add:
[Desktop Entry]
Name=Qgis2
Comment=Qgis2
Exec=bash -c 'export PATH="/home/{username}/miniconda2/bin:$PATH" && /home/{username}/miniconda2/bin/qgis'
Icon=/home/{username}/miniconda2/share/qgis/images/icons/qgis-icon-60x60.png
Terminal=false
Type=Application
Name[en_US]=Qgis2
3º) Go to Desktop and run Qgis
Or
1º) Create file Qgis2.desktop in /usr/share/applications
cd /usr/share/applications
touch Qgis2.desktop
2º) Open it and add:
[Desktop Entry]
Name=Qgis2
Comment=Qgis2
Exec=bash -c 'export PATH="/home/{username}/miniconda2/bin:$PATH" && /home/{username}/miniconda2/bin/qgis'
Icon=/home/{username}/miniconda2/share/qgis/images/icons/qgis-icon-60x60.png
Terminal=false
Type=Application
Name[en_US]=Qgis2
2º) Give permission to run it
sudo chmod +x Qgis2.desktop
Now you can run using Application menu...