Disable ubuntu kernel auto update
Software & updates

Check current kernel (5.15.0-37)
1 | uname -a |

Show all kernel
1 | dpkg -l | grep linux |

Hold specific version kernel (5.15.0-37)
1 | sudo apt-mark hold linux-headers-5.15.0-37 \ |
Check kernel hold
1 | dpkg --get-selections | grep hold |

Ref : Ubuntu 禁止内核更新