I had to force shutdown (by long pressing the start button) Ubuntu 18.04 after the system froze. In such cases usually I would try grub boot loader. A previous solution suggested steps from grub menu (Error: invalid environment block. Press any key to continue), but in my case even the grub menu is not showing.

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    A look at bugs.launchpad.net/ubuntu/+source/grub2/+bug/439784 (old) shows its usually a result of filesyste corruption. Maybe boot a 'live' environment (eg. your Ubuntu install media) and fsck (file system check) your partitions – guiverc Jul 8 '18 at 3:19
  • Thanks a lot! booting from live cd and doing a fsck on file system worked. – Kannan Jul 8 '18 at 14:22
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    Don't forget to click the check mark next to the answer below that @guiverc posted. This lets other users knows the answer is the accepted solution. Also click the grey chevron to up-vote the answer. This gives the author 10 more points. Thank you. – WinEunuuchs2Unix Jul 8 '18 at 15:29

Boot a live environment (eg. your Ubuntu install media, selecting 'try ubuntu') and do a fsck (file system check) of your partitions.

Reboot and it should be okay.

This is suggested due to a scan of https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/439784 (old) which showed the most common cause for this error was file-system corruption.

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