Mmmm if I remove the USB cable while it is counting the errors for uploading then it does the following.
C:\Users\PieterC>D:\Software\arduino-1.8.7\hardware\tools\avr/bin/avrdude -CD:\Software\arduino-1.8.7\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -carduino -PCOM6 -b115200 -D -Uflash:w:C:\Users\PieterC\AppData\Local\Temp\arduino_build_686597/sketch_nov30a.ino.hex:i
avrdude: Version 6.3-20171130
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "D:\Software\arduino-1.8.7\hardware\tools\avr/etc/avrdude.conf"
Using Port : COM6
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x0a
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x0a
============= Removed the cable to UNO here ========================================
avrdude: ser_recv(): read error: Access is denied.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x0a
avrdude: ser_send(): write error: sorry no info avail
avrdude: ser_recv(): read error: Access is denied.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x0a
avrdude: ser_send(): write error: sorry no info avail
avrdude: ser_recv(): read error: Access is denied.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x0a
avrdude: ser_send(): write error: sorry no info avail
avrdude: ser_recv(): read error: Access is denied.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x0a
avrdude: ser_send(): write error: sorry no info avail
avrdude: ser_recv(): read error: Access is denied.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x0a
avrdude: ser_send(): write error: sorry no info avail
avrdude: ser_recv(): read error: Access is denied.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x0a
avrdude: ser_send(): write error: sorry no info avail
avrdude: ser_recv(): read error: Access is denied.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x0a
avrdude: ser_send(): write error: sorry no info avail
avrdude: ser_recv(): read error: Access is denied.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x0a
avrdude: ser_drain(): read error: Access is denied.
avrdude done. Thank you.