Additional info from the duplicate, maybe it's useful here:
unity-2d-panel: [WARNING] libindicator: Unable to load icon from file '. GThemedIcon battery-full-symbolic gpm-battery-100 battery-full ' because: Failed to open file '. GThemedIcon battery-full-symbolic gpm-battery-100 battery-full ': No such file or directory
Additional info from the duplicate, maybe it's useful here:
unity-2d-panel: [WARNING] libindicator: Unable to load icon from file '. GThemedIcon battery- full-symbolic gpm-battery-100 battery-full ' because: Failed to open file '. GThemedIcon battery- full-symbolic gpm-battery-100 battery-full ': No such file or directory