I never liked KDE in the old days, but now it's the only choice in my mind.
If I had to pick a backup, probably xfce.
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I never liked KDE in the old days, but now it's the only choice in my mind.
If I had to pick a backup, probably xfce.
Would openbox count?
80% of the full UI of a proper de but with 30% impact on really slow hardware.
Moksha DE is also good one. Budgie feels more bettter for new users than Cinnamon