1.5.5.2 Maintenance Release

1.5.5.1 plus the following:

Upgrade script now keeps any custom RDP share, RDP host or RDP printer names if these were configured at first install (can now also manually update these values within the upgrade script process)
Permissions updates to ensure smoother compatilbilty with Ubuntu 23 & 24
Minor harmonisation betwen install & upgrade script's OS detetection methods
Fixed a minor syntax error relating to remote sql instance install selection
Various script tidy ups