Ubuntu
grub2 package

grub-mkfont outputs fonts that grub cannot use (font characters not in ascending order: 0 <= 0)

Bug #729470 reported by Paul Sladen
28
This bug affects 5 people
Affects Status Importance Assigned to Milestone
grub2 (Ubuntu)
Expired
Undecided
Unassigned

Bug Description

Binary package hint: grub2

As part of validation of the utility of the Ubuntu Mono in-development fonts I've been doing some tests for using them in Grub, Console, gfxboot and text-installer.

Currently the "Ubuntu Beta Mono" only has about 1200 codepoints, so the rest need to fall back to an existing full-coverage font. Grub currently uses Unifont for this.

  Current attempt at generation is:

  BASE=UbuntuBetaMono500-hacked
  grub-mkfont -s16 -o $BASE.pf2 $BASE.[ot]tf /usr/share/fonts/truetype/unifont/unifont.ttf

with the following in '/etc/default/grub':

  GRUB_FONT=/boot/grub/UbuntuBetaMono500-hacked.pf2

however, after an 'update-grub' and reboot the message:

  font characters not in ascending order: 0 <= 0

is printed, which appears to be coming from:

  ./grub-core/font/font.c

Ideally grub-mkfont should produce self-compliant .pf2 fonts!

Revision history for this message
Paul Sladen (sladen) wrote :

Characters from both appear to be being inserted into the same file, the 'm' with the short centre stem is coming from Ubuntu Mono.

  Glyph #191, U+006d
  Width 7, Height 8, X offset 1, Y offset 0, Device width 8
  +.......
  +.......
  +.......
  +.......
  +.......
  +.......
  +###_##_
  +#__#__#
  +#__#__#
  +#__#__#
  +#__#__#
  +#__#__#
  +#__#__#
  +#__#__#
  +.......
  +.......
  +.......

  Glyph #192, U+006d
  Width 6, Height 7, X offset 1, Y offset 0, Device width 8
  +.......
  +.......
  +.......
  +.......
  +.......
  +.......
  +.......
  +######.
  +#_##_#.
  +#_##_#.
  +#_##_#.
  +#____#.
  +#____#.
  +#____#+
  +.......
  +.......
  +.......

Revision history for this message
Paul Sladen (sladen) wrote :

Neither do attempts at forced subsetting work:

  grub-mkfont -v -v -v -v -s16 -o UbuntuBetaMono500-hacked.pf2 --range=0x0-0x1f,0x100-0x1ffff /usr/share/fonts/truetype/unifont/unifont.ttf --range=0x20-0x7f UbuntuBetaMono500-hacked.[ot]tf

Here, the first use of '--range' is taken as the canonical one and applied to the (output) rather than the following input(s).

Revision history for this message
Colin Watson (cjwatson) wrote :

Where can I get a copy of the font file that exhibits this bug?

Revision history for this message
Paul Sladen (sladen) wrote :

In particular:

  https://chinstrap.canonical.com/~sladen/UbuntuBetaMono500-hacked.otf

but passing any two fonts to 'grub-mkfont' has the same effect.

Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in grub2 (Ubuntu):
status: New → Confirmed
Revision history for this message
Marcus Tomlinson (marcustomlinson) wrote :

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

Changed in grub2 (Ubuntu):
status: Confirmed → Incomplete
Revision history for this message
Launchpad Janitor (janitor) wrote :

[Expired for grub2 (Ubuntu) because there has been no activity for 60 days.]

Changed in grub2 (Ubuntu):
status: Incomplete → Expired
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