嗨，我尝试升级，结果如下。你能帮助我吗？抱歉，我对 Ubuntu 不太熟悉，所以我希望我能理解你的回答。谢谢！
sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up grub-pc (2.02-2ubuntu8.6) ...
/var/lib/dpkg/info/grub-pc.config: 34: /etc/default/grub: Syntax error: EOF in backquote substitution
dpkg: error processing package grub-pc (--configure):
installed grub-pc package post-installation script subprocess returned error exit status 2
Setting up linux-image-4.15.0-36-generic (4.15.0-36.39) ...
Processing triggers for linux-image-4.15.0-36-generic (4.15.0-36.39) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.15.0-36-generic
/etc/kernel/postinst.d/zz-update-grub:
/usr/sbin/grub-mkconfig: 34: /etc/default/grub: Syntax error: EOF in backquote substitution
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 2
dpkg: error processing package linux-image-4.15.0-36-generic (--configure):
installed linux-image-4.15.0-36-generic package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
grub-pc
linux-image-4.15.0-36-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)
输出cat /etc/default/grub：
# 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_STYLE=hidden
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX="ipv6.disable=1""
# 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
答案1
我发现了有问题的一行：
GRUB_CMDLINE_LINUX="ipv6.disable=1""
您有两个结束语。
编辑该行，删除最后一句引文：
GRUB_CMDLINE_LINUX="ipv6.disable=1"
然后继续安装sudo apt-get install -f。