I had been running the Backups program successfully in Lubuntu 18.04.3, in order to backup the Home folder to an external drive (which has plenty of space on it).
The Backups program worked successfully for several months. For the last 318 days now, though, the daily attempts of the Backups program to perform backups automatically have failed. And the Backup Now button is grayed out. (Since then until now, I was too overwhelmed to get engaged on this web site to try to get help to fix the problem.)
I am a relative newbie - and almost always I use GUIs. I can perform Terminal commands IF they are provided together with complete and precise instructions.
rsync& terminal tools common to all Ubuntu systems), nor see any with packages.ubuntu.com/bionic/lubuntu-desktop (I suspect you've added it and it's not a default program). I'm guessing your external WD drive is NTFS thus non-POSIX (unless you re-formatted it) so as I don't know the program, and it's a foreign fs I'd explore as per my prior comment.
pcmanfm) and navigate directory where you save your backups, and try to create (
touchis the command, but you can right-click and Create New and select "Empty File" which is the
touchcommand). Does this provide any clues? (ie. error messages). I prefer commands as the error messages are easier to see errors when they occur, a quick play with copy/paste & create-new (
touch) both had errors visible & not visible
Execline in the Desktop Entry. You may want to
grep -Ri backup /usr/share/applicationsto figure out which file it is. Then
grep Exec /path/to/file.desktopto get the
Execline. That will tell us the executable. You can use
which executableto find its path. And you can use
dpkg -S /path/to/executableto find out which package provides it.
/usr/is a special Linux directory, and is not related to "user" files in Linix (they are in /home/). help.ubuntu.com/community/LinuxFilesystemTreeOverview refers to "/usr" as "/usr contains the majority of user utilities and applications, and partly replicates the root directory structure, containing for instance, among others, /usr/bin/ and /usr/lib" I'm aware of Deja Dup but having never used it, I can't offer any advice sorry.