this is when try a GPT partition
Error Boost.Python en el proceso "bootldr".
<class 'subprocess.CalledProcessError'>
Command 'grub-install /dev/sda' returned non-zero exit status 1.
Traceback:
File "/usr/lib/calamares/modules/bootldr/main.py", line 221, in run
install_bootloader(boot_loader, fw_type)
File "/usr/lib/calamares/modules/bootldr/main.py", line 207, in install_bootloader
check_target_env_call(["grub-install", install_path])
File "<string>", line 2, in <module>
https://pastebin.com/uWKyypBJ
this is the log for an erase disk installation (with the same stick)
https://pastebin.com/s781HJTh
