Using Lubuntu 18.04 LTS graphical file manager pcmanfm, can not delete a non-empty subdirectory on a remote Network Attached Storage samba smb shared folder. Lubuntu 16.04 LTS did not behave this way. With 18.04 LTS, must navigate through the entire directory structure, deleting files in each individual subdirectory. As a work-around, I found that I can delete a non-empty subdir on a NAS smb share from the Terminal command line using the "rm -rf" command.
I have confirmed that the same behavior exists in Ubuntu 18.04 LTS using the nautilus file manager and also Ubuntu Mate 18.04 LTS using the caja file manager.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: pcmanfm 1.2.5-3ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic i686
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: i386
Config_pcmanfm_System_Lubuntu: Error: [Errno 2] No such file or directory: '/etc/xdg/pcmanfm/Lubuntu/lubuntu.conf'
CurrentDesktop: LXDE
Date: Tue Jun 19 01:04:26 2018
InstallationDate: Installed on 2018-05-04 (46 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release i386 (20180426)
SourcePackage: pcmanfm
Udisks_dump: Error: [Errno 2] No such file or directory: 'udisks': 'udisks'
UpgradeStatus: No upgrade log present (probably fresh install)
Clarification: when I try to delete a non-empty NAS smb subdirectory using pcmanfm, the directory disappears from the window, but the directory is not really gone. If I navigate away from the current folder and then come back (or if I press F5 to reload the folder), the subdirectory that I thought that I had just deleted reappears on the screen.