As of this morning Jan 13th, 2020, all of my students cannot upload sketches to the Arduino UNO via the online tools and Chromebook extension.
This was working on Friday.
Here is an error message:
----------------------------------------------
Linking everything together...
lto1: fatal error: bytecode stream in file '/tmp/718722975/build/../../core/core_arduino_avr_uno_0fd389f0184d5a21fcc443ff311da7f1.a' generated with LTO version 4.1 instead of the expected 6.0
compilation terminated.
lto-wrapper: fatal error: /home/builder/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino5/bin/avr-gcc returned 1 exit status
compilation terminated.
/home/builder/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino5/bin/../lib/gcc/avr/7.3.0/../../../../avr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
exit status 1