This already had happened years ago when I tried to install Ubuntu without 
disconnecting from internet.
At least for me, this bug seems to occur when Linux kernel upgrades during 
installation, because when I disabled my WiFi that time, the installation was 
succeed.
I'll try to install again with WiFi turned off.

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https://bugs.launchpad.net/bugs/1852831

Title:
  Install grub on /dev/sda failed during Ubuntu installation

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