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Tags: grub2   kernel  
Link: 🔍 See Original Answer on Ask Ubuntu 🔗

URL: https://askubuntu.com/q/1161535
Title: How can I boot with an older kernel version?
ID: /2019/07/27/How-can-I-boot-with-an-older-kernel-version_
Created: July 27, 2019
Upload: November 24, 2022    Layout:  post
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Jackkobec’s Answer describes a method of viewing grub.cfg and scrolling through source code to find a menu number. An easier way is with this script:

Grub Version: 2.02~beta2-36ubuntu3.22


``` 
     ┌───────────┤ Use arrow, page, home & end keys. Tab toggle option ├────────────┐
     │ Menu No.     ----------- Menu Name -----------                               │ 
     │                                                                              │ 
     │  1>3  Ubuntu, with Linux 4.15.0-55-generic                                  ↑│ 
     │  1>6  Ubuntu, with Linux 4.15.0-54-generic                                  ▒│ 
     │  1>9  Ubuntu, with Linux 4.14.134-0414134-generic                           ▒│ 
     │  1>12 Ubuntu, with Linux 4.14.120-0414120-generic                           ▮│ 
     │  1>15 Ubuntu, with Linux 4.14.114-0414114-generic                           ▒│ 
     │  1>18 Ubuntu, with Linux 4.14.110-0414110-generic                           ▒│ 
     │  1>21 Ubuntu, with Linux 4.14.98-041498-generic                             ▒│ 
     │  1>24 Ubuntu, with Linux 4.14.89-041489-generic                             ▒│ 
     │  1>27 Ubuntu, with Linux 4.14.78-041478-generic                             ▒│ 
     │  1>30 Ubuntu, with Linux 4.14.70-041470-generic                             ▒│ 
     │  1>33 Ubuntu, with Linux 4.4.0-157-generic                                  ▒│ 
     │  1>36 Ubuntu, with Linux 3.16.60-031660-generic                             ▒│ 
     │  1>36 Ubuntu, with Linux 3.16.60-031660-generic                             ▒│ 
     │  2    Ubuntu 18.04.1 LTS (18.04) (on /dev/nvme0n1p10)                       ▒│ 
     │  3    Advanced options for Ubuntu 18.04.1 LTS (18.04) (on /dev/nvme0n1p10)  ▒│ 
     │  3>0  Ubuntu (on /dev/nvme0n1p10)                                           ↓│ 
     │                                                                              │ 
     │                                                                              │ 
     │                     [Display Grub Boot]            Exit                      │ 
     │                                                                              │ 
     └──────────────────────────────────────────────────────────────────────────────┘ 
                                                                                      
```


Note: In this example grub-menu.sh short was used to call the script. The short parameter suppresses these lines:

     │  1>10 Ubuntu, with Linux 4.14.134-0414134-generic (upstart)                 ▒│ 
     │  1>11 Ubuntu, with Linux 4.14.134-0414134-generic (recovery mode)           ▒│ 

Control keys

After scrolling through entries (you can use the mouse scroll wheel or arrow keys) press Escape to return to the command line.

If you press Enter the associate grub commands for the entry are displayed:

menuentry 'Ubuntu, with Linux 4.14.134-0414134-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.14.134-0414134-generic-advanced-b40b3925-70ef-447f-923e-1b05467c00e7' {
recordfail
savedefault
load_video
gfxmode $linux_gfx_mode
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod ext2
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root b40b3925-70ef-447f-923e-1b05467c00e7
else
search --no-floppy --fs-uuid --set=root b40b3925-70ef-447f-923e-1b05467c00e7
fi
echo 'Loading Linux 4.14.134-0414134-generic ...'
linux /boot/vmlinuz-4.14.134-0414134-generic root=UUID=b40b3925-70ef-447f-923e-1b05467c00e7 ro noplymouth fastboot acpiphp.disable=1 pcie_aspm=force vt.handoff=7 i915.fastboot=1 nopti nospectre_v2 nospec mem_sleep_default=deep
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.14.134-0414134-generic
}
Press <Enter> to continue

Updating grub to boot previous kernel

A set of grub commands exist for each menu entry. The compiled entries are all stored in /boot/grub/grub.cfg file.

In this example we want menu number `1>9> set as the default so we use:

sudo -H gedit /etc/default/grub

and find this line:

GRUB_DEFAULT=0

and change it to this:

GRUB_DEFAULT="1>9"

Then save the file and run

sudo update-grub
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