Ubuntu upgrade causes UTM to crash VM and corrupts it

**BEFORE SUBMITTING YOUR ISSUE, PLEASE LOOK AT THE PINNED ISSUES AND USE THE SEARCH FUNCTION TO MAKE SURE IT IS NOT ALREADY REPORTED. ALWAYS COMMENT ON AN EXISTING ISSUE INSTEAD OF MAKING A NEW ONE.**

**Describe the issue**
Ubuntu upgrade causes UTM to crash VM and corrupts it. Then the machine no longer boots. UTM shows a popup message about an error related to "illegal byte sequence" several times, which I have to dismiss. The VM continues running until I shutdown or reboot. Then it no longer boots again due to being a corrupted image.

The VM is running Ubuntu 23.04 ARM64. I am attempting a full upgrade to latest version available.

The VM is also running from an external M2. NVMe SSD in a USB-C enclosure. I have never seen a such error in like 3 years running UTM.

**Configuration**
* UTM Version: 4.4.5
* macOS Version: macOS Sonoma 14.3
* Mac Chip (Intel, M1, ...): Mac Studio M1 Max

**Crash log**
The app didn't crash, however showed a sequence of errors while trying to update a Ubuntu VM. "Illegal byte sequence"

**Debug log**
Unable to create one due to the machine being unable to boot again.

**Upload VM**
Well can't upload it due to sensitive data contained on it, plus the machine was replaced by a working backup.