>"I have dowlowded a deb archive and install it..."
The way this is worded indicates only one .deb file was installed, which would be why it didn't show up in GRUB. Did you get a chance to review https://wiki.ubuntu.com/Kernel/MainlineBuilds for guidance?
>"but when I tried to compile the kernel..."
You would't have to compile kernels, as the .debs are compiled for you.
Battant:
>"I have dowlowded a deb archive and install it..."
The way this is worded indicates only one .deb file was installed, which would be why it didn't show up in GRUB. Did you get a chance to review https:/ /wiki.ubuntu. com/Kernel/ MainlineBuilds for guidance?
>"but when I tried to compile the kernel..."
You would't have to compile kernels, as the .debs are compiled for you.