Once Kubuntu is running you should see an unfamiliar desktop picture with a task-bar along the bottom.
The cog-wheel "Application Launcher" at the left of the task-bar gives access to the installed apps. The familiar Microsoft apps are roughly equivalent to the following which come pre-installed:
If you want more apps, ideally install them via the "Discover" App Store. I used this to obtain free of charge:
For printer control, look for the device in the list at System Settings > printers, double-click on the device, and select a "Make/model" setting that works. Check that you can print from LibreOffice Writer and a pdf. Check that the scanlite app communicates with your scanner. (Bespoke software from the printer manufacturer didn't work because it couldn't find my printer when every other app could.)
For making password-protected folders I use Veracrypt which is available online (at https://veracrypt.io/en/Home.html Debian version) for both Windows and Linux systems.
Two programs emulate Windows so that you can run your favourite programs such as games: Dosbox (which I have not tried) offers environments from DOS up to Windows XP, and Bottles (from https://usebottles.com) covers Windows 7 to Windows 11. A Bottle is a subdirectory containing a folder "drive_c". You can copy the installation files for a Windows program into "drive_c" and run the setup; it will create its own folders in "drive_c/Program files" or "drive_c/Program files (x86)" containing the .exe to run the program. The users group recommends creating a separate Bottle for each program, to avoid confusion.
© David Billin 2026