Изменение шрифта по умолчанию в GRUB2 - «Неизвестная функция шрифта gsub»

Я хотел изменить GRUB2 по умолчанию, потому что он для меня мал. Я скачал шрифт ubuntu и попытался преобразовать его в *.pf2:

grub-mkfont -s -16 --range=0x0-0x7f -o ./ubufont.pf2 ubuntufont.ttf

, но он показал некоторые «ошибки» и шрифт не был создан: [ 116]

Unknown gsub font feature gsub 0x63617365 (case)
Unknown gsub font feature gsub 0x63617365 (case)
Unknown gsub font feature gsub 0x63617365 (case)
Unknown gsub font feature gsub 0x63617365 (case)
Unknown gsub font feature gsub 0x63617365 (case)
Unknown gsub font feature gsub 0x63617365 (case)
Unknown gsub font feature gsub 0x63617365 (case)
Unknown gsub font feature gsub 0x63617365 (case)
Unknown gsub font feature gsub 0x63617365 (case)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x646e6f6d (dnom)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x66726163 (frac)
Unknown gsub font feature gsub 0x6c6f636c (locl)
Unknown gsub font feature gsub 0x6c6f636c (locl)
Unknown gsub font feature gsub 0x6c6f636c (locl)
Unknown gsub font feature gsub 0x6c6f636c (locl)
Unknown gsub font feature gsub 0x6c6f636c (locl)
Unknown gsub font feature gsub 0x6c6f636c (locl)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6e756d72 (numr)
Unknown gsub font feature gsub 0x6f72646e (ordn)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x706e756d (pnum)
Unknown gsub font feature gsub 0x73616c74 (salt)
Unknown gsub font feature gsub 0x73616c74 (salt)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73696e66 (sinf)
Unknown gsub font feature gsub 0x73733031 (ss01)
Unknown gsub font feature gsub 0x73733031 (ss01)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73756273 (subs)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x73757073 (sups)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)
Unknown gsub font feature gsub 0x746e756d (tnum)

Так как я могу изменить шрифт GRUB2 по умолчанию на шрифт Ubuntu? Приветствия