The strange "start button" icon of /usr/share/lubuntu/images/lubuntu-logo.png should be replaced by the old 1610-lubuntu-logo.png, that is still available in the images folder.
The strange "start button" icon of /usr/share/ lubuntu/ images/ lubuntu- logo.png should be replaced by the old 1610-lubuntu- logo.png, that is still available in the images folder.