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Bluez trying to connect to my PC?
(lemm.ee)
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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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It very well could be a neighbor with a Linux computer. As others have said, bluez is the name of a Linux Bluetooth controller. Bluetooth can have surprising range, and if you're in an apartment, that'd be my first guess. It could be just a passive scan for devices the OS is doing.
A large number of smart devices run Linux. A second guess is, have you acquired any devices recently with WiFi? I have a wireless camera that I know is running Linux.