>I found out that sometimes I have the warning:There were some bugs in menu-cache that leaded to menu-cached crash and
>$ lxpanel --profile Lubuntu
>** (process:4483): WARNING **: removed previous socket file
also libmenu-cache1 package in Ubuntu conflicts with libmenu-cache2 and
libmenu-cache3 despite the fact they are co-installable, that's Ubuntu
packaging bug which is fixed only in lubuntu-dev PPA. Update to version
0.5.0 and make sure both libfm and lxpanel use the same libmenu-cache,
please, and those problems should vanish.