This is the last article in a three part series about installing Arch Linux. Part 1 gets you through the base installation on an UEFI system. Part 2 deals with the addition of tools and adding some useful configuration. Time to add some graphics to the mix. Everything here is based on the official Arch Linux documentation on Xorg and KDE.
Step 2: Logging into the KDE Plasma Session on Ubuntu. Proceed to input your credentials and log in. You should see “Plasma” as the default session type in the top left-hand corner of your screen. If it’s not already selected, click on the session drop-down menu and choose “Plasma”.

From dir /usr/share/xsessions move all *.desktop file to another directory (unnecessary_env, for example) and leave only one you need (in my case - xfce.desktop): $ ls /usr/share/xsessions xfce.desktop unnecessary_env/. After logout/reboot XFCE will be loaded by default. Note!

1. Install packages. Open a terminal and run the following command to install those packages. pacman -S --needed xorg sddm. pacman -S --needed plasma kde-applications. When asked to select a package, press enter for default selection. If you are unsure, choose the following options when asked on the screen. I tried it for a few minutes, and thought I would keep it alongside GNOME. However, then I realized that KDE Connect from Plasma was interfering with the functionality of GSConnect in GNOME, so I tried deleting KDE with sudo tasksel remove kubuntu-desktop. While watching the process, I realized that it was deleting a lot of software that it
bluetooth not working on kde plasma desktop. I wrote some notes for installing bluetooth. It worked on my endeavour os but not here in pure arch linux. yay -S bluedevil sudo systemctl enable bluetooth sudo systemctl start bluetooth sudo vim /etc/bluetoooth/main.conf and go all the way down and change autoenable = true kde-plasma friendly: https
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how to uninstall kde plasma arch