The dmesg confirms that the whole kernel line is intact, so it is not an issue of line wrapping in the text editor:
[ 0.000000] Kernel command line: floppy.allowed_drive_mask=0 boot=casper noprompt cdrom-detect/try-usb=true lang=it locale=it_IT xforcevesa debug
I am not sure xforcevesa is supported any longer.
I guess the above logs are from a successful boot? Are you able to provide these logs for a failed boot?