Recompile

For ubuntu 22.04

1. Install VM
   • I used ubuntu server iso (I don't need GUI)
   • Allocate enough disk size (at least 30GB aside from default os)
2. sudo -s
   • Use root permission
3. Install dependencies

   apt update && \
   apt upgrade -y && \
   apt-get install libncurses-dev libssl-dev libelf-dev flex bison pkg-config dpkg-dev libssl-dev libelf-dev dwarves -y

4. cd /usr/src && install linux-source
5. cd linux-source-xxxx (xxx is the version that you downloaded)
6. Inside the directory, you may see the following files
   • debian
   • debian.master
   • linux-source-xxx.gz.bz2
7. Extract the linux-source-xxx.gz.bz2 with tar -xvf linux*
8. cd linux-source-xxx
9. Copy the .config from /boot

   cp /boot/config-`uname -r` .config
   

10. make menuconfig
    • Feel free to directly edit the info you want in the .config if you are familiar with it.
11. Select Local version (press Enter and enter your student ID)
    • DO NOT use capital letters. That violates debian package's naming convention
12. Tick Automatically append the local version (press space)
13. Save the config and exit
14. vim .config to remove CONFIG_SYSTEM_TRUSTED_KEYS and CONFIG_SYSTEM_REVOCATION_KEYS if you are not familiar with the vim editor
    • /CONFIG_SYSTEM_TRUSTED_KEYS (search words with /)
    • di" (delete the word inside "")
    • :wq (quit the vim editor)
15. make -j12 deb-pkg
    • This may take 20 minutes to finish
    • -j12 specify the number of CPUs you want to utilize (the number depends on how many CPU you assign when you create a VM)
    • deb-pkg build debian package
16. cd .. to see the packages you built
17. dpkg -i linux-image-xxx.deb (the one with your student ID)
18. dpkg -i linux-header-xxx.deb (the one with your student ID)
19. update-grub || update-grub2
    • not necessary but recommended
    • grub is the kernel manager managing the kernels you can boot from
    • update-grub is the older version of update-grub2
    • ||: if the previous command failed do the next command
20. Reboot your VM and try the following commands:
    1. uname -a and uname -r
    2. ifconfig -a (sudo apt install net-tools)
       • The command is actually deprecated. I recommend you use ip a for your daily usage
    3. ping 140.117.11.1 (Ctrl-c or Ctrl-d to terminate it)