Bug 424189

SUMMARY
We have been using Krusader for a few years to synchronise files between three dual-boot Ubuntu / Windows machines and it has worked well. We've recently upgraded to Ubuntu 20.04, and while testing things out we discovered that in 20.04 Krusader was no longer able to properly synchronise directories shared with Samba. 

Until upgrading to 20.04, we simply opened Nautilus and connected to the share over the network by finding the server listed in "Other locations" in Nautilus. When clicking on the required server name a list of shared locations was shown on this server and we then selected the location we wanted to mount to sync up. We then used Krusader to navigate to the share mounted with gvfs eg: 

/run/user/1000/gvfs/share-name

and then used Krusader to sync up the two directories. When syncing up the original modification dates of files were preserved on files that were copied across.

Now if we click on a server listed in "Other locations" in Nautilus an error window is displayed with the message: Unable to access location, Failed to retrieve share list from server: Invalid Argument.
This may be because of the removal of SMB1 / NT1, so we had to find a new method of mounting the share. We do not want to set the samba servers to use SMB1 as this is now regarded as insecure.
We found a new method but unfortunately this does not work with Krusader. It does work with Double Commander. The new method we found was as follows:

1) In Nautilus 'Other Locations' we type in the samba server address including the shared location eg:

smb://192.168.1.99/Storage

This brings up the window prompting for user name and password for the samba share.
After this the samba share location can be accessed through Nautilus as normal and the modification dates of files that are copied using Nautilus are preserved.

2) We then use Double Commander to navigate to the share at

/run/user/1000/gvfs/share-name
and sync up the two directories with this. Modification dates of files that are copied are preserved.

Krusader is our preferred application. We tried using Krusader in the same way, and it was only partly successful:

STEPS TO REPRODUCE

1. In Nautilus 'Other Locations' we type in the samba server address including the shared location eg:

smb://192.168.1.99/Storage

This brings up the window prompting for user name and password for the samba share.
After this the samba share location can be accessed through Nautilus as normal and the modification dates of files that are copied using Nautilus are preserved.

2. We then use Krusader to navigate to the share at

/run/user/1000/gvfs/share-name

and sync up the two directories with this. 

OBSERVED RESULT
The synch with Krusader partly works OK, but larger files over about 4MB time out before they have finished copying whereas Double Commander works without any problem. 
The modification dates of the files that are copy successfully are preserved.

EXPECTED RESULT
All files selected for copying should copy successfully and the modification dates should be preserved. 


SOFTWARE/OS VERSIONS
Linux/Ubuntu 20.04


ADDITIONAL INFORMATION