Unable to Obtain MCU-Linux

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From your log:

Timeout with MCU 'mcu' (eventtime=648.608440)
Transition to shutdown state: Lost communication with MCU 'mcu'

then followed by:

b'Got EOF when reading from device'

Unfortunately these kind of errors are hard to diagnose since there is not a single reason like BRLTTY or wrong permissions.

See Timeout with MCU / Lost communication with MCU for some hints.

You can also run sudo dmesg -ew (this will give you a permanent “monitoring” output). Then provoke the error and check if there are USB related topics in the output.
This is not a Klipper error but an error between your printer board and the Linux host. Klipper is just reporting it. Unfortunately these ch341 UART chips are a major pain in the lower back and known to be problematic.

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