I tried to install language support package through lubuntu software center. Though the package was added to Apps basket, I could not install. The error message was - ' You are not allowed to perform this action. You don't have the required privileges to perform the action.'. Then I installed 'language-selector gnome' package from synaptic. When I tried to add regional language, an error message appeared - ' You are not allowed to perform this action. You don't have the required privileges to perform the action.'. When I closed the error message and clicked 'Install/Remove language' button, I get the error message :
" org.freedesktop.Policykit. Error. Failed

S.Nagarajan