I found that this problem may be caused by libfreetype。
There are some problems with unicode.pf2 in the Grub2 of 1604（Size only
1.4M），and 1510 is good(Size is 2.4M)。
in 1604，if the libfreetype version is reduced to 1510(2.5.2-4ubuntu2), and
build build-grub-mkfont，the unicode.pf2 built by./build-grub-mkfont is normal。
** Also affects: freetype (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1559933
Title:
[Grub] There are messy codes on displaying Chinese characters in grub
after install xenial-desktop_0320.
Status in Ubuntu Kylin:
Triaged
Status in freetype package in Ubuntu:
New
Status in grub2 package in Ubuntu:
In Progress
Bug description:
[Machine]
Dell Vostro 3900
[Version]
xenial-desktop_0320（amd64&i386）
[Details]
[Grub] There are messy codes on displaying Chinese characters in grub after
install xenial-desktop_0320.
[Test Case]
1. nstall xenial-desktop_0320 & reboot
2. Check the grub
Expected Result: no messy codes in grub
Actual Result: There are messy codes in grub
安装xenial-desktop_0320后，grub出现乱码
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