fatal error generated with LTO version 4.1 instead of the expected 6.0


As my profile states, I'm new, and things were going great for a couple of days, then, compile errors stopped my coding. The errors began to occur right after I paid for my subscription, if that might somehow be an issue.

What I've done so far to try and fix the problem:

I apparently need LTO v6.0 (whatever that is) and I've searched for the download to no avail.

I've searched the Forum and the internet for answers; the most recent posting I found was from Sept. 2019, which was before Windows 10 v1909 arrived (which I recently updated to from v18xx, but shouldn't be the issue).

I keep finding the issue RESOLVED, but I never find the resolution, .


I've uninstalled everything Arduino from my computer, then reinstalled (and yes, I installed the plugin), but to no avail.

I then uninstalled the Arduino IDE only, and I would launch Arduino IDE (create.arduino.cc) from the plugin icon on my Windows tray with the right-click popup menu and Go to Arduino Create command, but to no avail.

The thing I hate is this issue has apparently been resolved, but I can't find the answer; need help. My apologies for not better knowing how to find resolved issues.

Thank you for your time on this matter, as I'm desperate to return to Arduino coding!


HP laptop ADM Ryzen 5 2.0 GHz x64-based processor
Windows 10 v1909
Google Chrome v79.0.3945.117 64-bit

Arduino v1.8.10 from arduino-1.8.10-windows.exe and ArduinoCreateAgent-1.1-windows-installer-chrome.exe installers.

compiling test using
Rex Qualis UNO R3 board on COM:3

If more info is required, please let me know what you need.

Here's the final error message:

Linking everything together...
lto1: fatal error: bytecode stream in file '/tmp/992990105/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

I apparently need LTO v6.0

This is a network-wide issue, apparently, being I've seen this same issue posted by several others.
If anyone finds the answer, a message would be appreciated. Thanks.

According to the team it was fixed.
Thanks for your report.


many thanks!