For Linux Mint 18.3 MATE 32-bit.
I thought that the GUI Synaptic Package Manager and the apt-get command line were working with the same databases of available packages. But this doesn't always seem to the case(?)
Several times I've tried using Synaptic to locate and install one or another package. But Synaptic won't list the package, even after clicking Refresh to reload its list of available software.
When that happens I try using
sudo apt-get install [packagename]. More than once apt-get immediately located the "missing" (from Synaptic) package and installed it straightaway.
Is there anything I should be doing to more effectively synchronize Synaptic? Or...?
As requested in the comments, I'm updating my question with a screenshot that illustrates the problem.
I started Synaptic, clicked Refresh, then type kwrite into the Search text entry area. Synaptic didn't find kwrite.
I then proceeded directly to a terminal where I was able to use apt install to locate and install kwrite.
This happens surprisingly often. Wish I could figure out why...