Why is there no bluetooth-monitor device on Linux Mint?

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I've recently noticed that my Wireshark (2.6.10) installed on Mint 19.3 would only propose me to capture Bluetooth traffic with the following Link-layer Header "Bluetooth HCI UART transport layer plus pseudo-header".

Is it possible for me to change this ? I'd like to have the "Bluetooth Linux Monitor" Link Layer Header proposed instead.

For now, the way to change it is to switch to a Linux that's not based on Debian; the maintainers of the libpcap Debian package appear to have deliberately disabled the ability to sniff using the Bluetooth monitor mechanism in libpcap.

I don't know why this is, but I've reported it as a Debian bug. Hopefully, they'll fix that, and it'll propagate down to Ubuntu, Mint, etc..

You can look at these Link-layer Header types here. It seems the first you mention is "LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR" (201), while the second is "LINKTYPE_BLUETOOTH_LINUX_MONITOR" (254). The text for that says: "Bluetooth Linux Monitor encapsulation of traffic for the BlueZ stack." Do you have that? Since both have a different header, the dissector needs to be able to understand those. It may be that the version 2.6 doesn't (you didn't specify the Wireshark version on your Manjaro machine).