@ Konstantinos, Ubuntu updated gnome-panel to 1:2.30.2-0ubuntu0.2 a few days ago which has overwritten your last fixed ppa package 1:2.30.2-0ubuntu0.2~ppa1. So this bug has returned until you provide another update.
@ Konstantinos, Ubuntu updated gnome-panel to 1:2.30.2-0ubuntu0.2 a few days ago which has overwritten your last fixed ppa package 1:2.30. 2-0ubuntu0. 2~ppa1. So this bug has returned until you provide another update.