I am already running Plasma 5.4 on my Arch Linux system: I installed it the moment I saw the announcement. You may have to add some repository to install Plasma 5.4 on your system. All I can say is it’s extremely stable on my Arch system and it’s ready for prime time. So if you have been holding back from Plasma 5, this is the time to upgrade.
Trust me, you won’t regret it.
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