[Bug 1752817] Re: grub2 shows both theme-styled menu and text-based menu

[EmilioEA]

I can confirm the same behavior. With the last update, the grub screen
flickers quite a bit.

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https://bugs.launchpad.net/bugs/1752817

Title:
  grub2 shows both theme-styled menu and text-based menu

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  This behavior matters Ubuntu 17.10 (since last upgrade on 2018-03-02, 2.02~beta3-4ubuntu7.2) and Ubuntu 18.04.
  A theme is set in /default/grub as GRUB_THEME=/boot/grub/themes/poly-light/theme.txt. Before this upgrade the theme-based menu entries were shown normally without overlayed text menu.
  The attachment shows the effect: now both kind of menus are shown at the same time and both menus are selectable at the same time. While selecting one of the menu entries both menus are flickering ('fight' to be at the top). It is independent from different themes and screen resolutions.

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