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URL:
https://askubuntu.com/q/869670
Title:
Error unknown command hwmatch
ID:
/2017/01/09/Error-unknown-command-hwmatch
Created:
January 9, 2017
Edited: March 20, 2017
Upload:
April 8, 2024
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Dealing strictly with the hwmatch problem look into /etc/grub.d/10_linux and you will find it listed something like this near the bottom (9th line down on this display):
# Use ELILO's generic "efifb" when it's known to be available.
# FIXME: We need an interface to select vesafb in case efifb can't be used.
if [ "x$GRUB_GFXPAYLOAD_LINUX" != x ] || [ "$gfxpayload_dynamic" = 0 ]; then
echo "set linux_gfx_mode=$GRUB_GFXPAYLOAD_LINUX"
else
cat << EOF
if [ "\${recordfail}" != 1 ]; then
if [ -e \${prefix}/gfxblacklist.txt ]; then
if hwmatch \${prefix}/gfxblacklist.txt 3; then
if [ \${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
EOF
fi
For whatever reason your grub installation is incomplete and missing hwmatch module. You should see it among many other files when you use ll /boot/grub/i386-pc:
-rw-r--r-- 1 root root 47292 Dec 5 07:13 hwmatch.mod
-rw-r--r-- 1 root root 2928 Dec 5 07:13 iorw.mod
-rw-r--r-- 1 root root 8656 Dec 5 07:13 iso9660.mod
-rw-r--r-- 1 root root 6168 Dec 5 07:13 jfs.mod
-rw-r--r-- 1 root root 6280 Dec 5 07:13 jpeg.mod
-rw-r--r-- 1 root root 5112 Dec 5 07:13 keylayouts.mod
-rw-r--r-- 1 root root 2044 Dec 5 07:13 keystatus.mod
-rw-r--r-- 1 root root 6608 Dec 5 07:13 ldm.mod
-rw-r--r-- 1 root root 29816 Dec 5 07:13 legacycfg.mod
-rw-r--r-- 1 root root 14536 Dec 5 07:13 legacy_password_test.mod
-rw-r--r-- 1 root root 8048 Dec 5 07:13 linux16.mod
-rw-r--r-- 1 root root 13184 Dec 5 07:13 linux.mod
-rw-r--r-- 1 root root 100 Dec 5 07:13 load.cfg
-rw-r--r-- 1 root root 5924 Dec 5 07:13 loadenv.mod
-rw-r--r-- 1 root root 3056 Dec 5 07:13 loopback.mod
-rw-r--r-- 1 root root 4872 Dec 5 07:13 lsacpi.mod
-rw-r--r-- 1 root root 2352 Dec 5 07:13 lsapm.mod
-rw-r--r-- 1 root root 1884 Dec 5 07:13 lsmmap.mod
-rw-r--r-- 1 root root 4136 Dec 5 07:13 ls.mod
-rw-r--r-- 1 root root 4928 Dec 5 07:13 lspci.mod
-rw-r--r-- 1 root root 6724 Dec 5 07:13 luks.mod
-rw-r--r-- 1 root root 6776 Dec 5 07:13 lvm.mod
As per this bug report (bugs.launchpad.net - Ubuntu Upgrade from Lucid to Precise results in broken grub configuration) the easiest way of getting all the grub modules is to reinstall it.
You should run
sudo dpkg-reconfigure grub-pcand instruct it to
install the boot loader somewhere, probably /dev/vda.
Above is a direct quote from the bug report. As a comment here points out and looking at your link, this should be used instead:
sudo dpkg-reconfigure grub-efi-amd64
However looking at this post (superuser.com - How to reinstall grub2 efi) you must first boot with a live USB/DVD and use:
sudo mount /dev/sda2 /mnt #sda2 is the root partition
sudo mount /dev/sda1 /mnt/boot/efi #sda1 is the efi partition
for i in /dev /dev/pts /proc /sys; do sudo mount -B $i /mnt$i; done
sudo cp /etc/resolv.conf /mnt/etc/ #makes the network available after chrooting
modprobe efivars # make sure this is loaded
sudo chroot /mnt
The first step is to confirm that the file hwmatch is really missing. If so the easiest method is to simply copy it from:
/usr/lib/grub/i386-pc/hwmatch.mod
into the directory:
/boot/efi/efi/grub
This directory name comes from (https://help.ubuntu.com/community/UEFIBooting) where they say that is “mostly” the directory name. Please confirm for your installation.
The more complicated methods of dpkg-reconfigure should be approached with extreme caution and only after appropriate backups.