In latest stable version of SparkyLinux 4.8.1 LXDE I can't install package Remmina because is not available in repository. The package is listed in APTus.
I also know that Remmina is not available in Debian Stretch main repository, but is available in backports in Stretch.
Can this package with plugins be added to default Sparky repository ?
Adding backports from Debian Stretch to Sparky doesn't resolve problem with installation because Remmina requires libssh-4 (>= 0.8.0) but 0.7.3.2 is avaialable to install.
Remmina is in stable backports repos so you should activate the repos and refresh package list after.
I already did, but I forgot that to install package from backports I must do with command: apt -t stretch-backports install .....
PS. But maybe it is worth to add this package to default install of stable realase.