当我跑步sudo update-grub2或sudo update-grub
我得到了回应
源文件 `/etc/default/grub' /usr/sbin/grub-mkconfig: 1: /etc/default/grub: 如果：未找到
但是我的/etc/default/grub文件肯定在那里。内容如下：
If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
#Originally...
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX_DEFAULT="splash radeon.si_support=0 amdgpu.si_support=1 radeon.cik_support=0 amdgpu.cik_support=1"
GRUB_CMDLINE_LINUX=""
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
有线索知道错误可能是什么吗？谢谢！
答案1
错误消息
/usr/sbin/grub-mkconfig: 1: /etc/default/grub: If: not found
并没有告诉你文件 /etc/default/grub未找到，表示If在该文件的第 1 行未找到该命令。这是因为If应该是注释块的一部分，即
If you change this file, run 'update-grub' afterwards to update
应该
# If you change this file, run 'update-grub' afterwards to update
您需要编辑文件（sudoedit /etc/default/grub例如）并插入缺失的#
答案2
我遇到了类似的错误，不确定发生了什么，但是我的 /etc/default/grub 文件在最近的更新期间添加了一行：
“/etc/default/grub” 34L，1279C
位于该文件的底部，我将其注释掉，一切又恢复正常了！