Kernels can be found at https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D
For installing kernel 5.0.5 :
curl -LO https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.5/linux-headers-5.0.5-050005_5.0.5-050005.201903271212_all.deb
curl -LO https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.5/linux-image-unsigned-5.0.5-050005-generic_5.0.5-050005.201903271212_amd64.deb
curl -LO https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.5/linux-modules-5.0.5-050005-generic_5.0.5-050005.201903271212_amd64.deb
sudo dpkg -i *.deb
Reboot. In case you want to reboot into another kernel, edit /etc/default/grub
sudo vim /etc/default/grub
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
Comment out the GRUB_TIMEOUT_STYLE=hidden
line and increase the GRUB_TIMEOUT
sudo update-grub
sudo reboot
(You can change the default from 0 to any number)
Instructions can be found at: https://wiki.ubuntu.com/Kernel/MainlineBuilds