/usr/share/salome/idl/ is in salome-kernel-dev 6.5.0-7ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/salome/idl/salome/
/usr/share/salome/idl/salome/Calcium_Ports.idl
/usr/share/salome/idl/salome/DSC_Engines.idl
/usr/share/salome/idl/salome/Logger.idl
/usr/share/salome/idl/salome/Palm_Ports.idl
/usr/share/salome/idl/salome/SALOMEDS.idl
/usr/share/salome/idl/salome/SALOMEDS_Attributes.idl
/usr/share/salome/idl/salome/SALOME_Comm.idl
/usr/share/salome/idl/salome/SALOME_Component.idl
/usr/share/salome/idl/salome/SALOME_ContainerManager.idl
/usr/share/salome/idl/salome/SALOME_Exception.idl
/usr/share/salome/idl/salome/SALOME_GenericObj.idl
/usr/share/salome/idl/salome/SALOME_MPIContainer.idl
/usr/share/salome/idl/salome/SALOME_MPIObject.idl
/usr/share/salome/idl/salome/SALOME_ModuleCatalog.idl
/usr/share/salome/idl/salome/SALOME_PACOExtension.idl
/usr/share/salome/idl/salome/SALOME_ParamPorts.idl
/usr/share/salome/idl/salome/SALOME_Parametric.idl
/usr/share/salome/idl/salome/SALOME_Ports.idl
/usr/share/salome/idl/salome/SALOME_PyNode.idl
/usr/share/salome/idl/salome/SALOME_Registry.idl
/usr/share/salome/idl/salome/SALOME_RessourcesCatalog.idl
/usr/share/salome/idl/salome/SALOME_Session.idl
/usr/share/salome/idl/salome/SALOME_TestComponent.idl
/usr/share/salome/idl/salome/SALOME_TestMPIComponent.idl
/usr/share/salome/idl/salome/SALOME_TestModuleCatalog.idl
/usr/share/salome/idl/salome/SALOME_Types.idl
/usr/share/salome/idl/salome/nstest.idl