'apt-get source' should work - just double checked it here:

# just these two deb-src lines should be sufficient:
$ grep ^deb-src /etc/apt/sources.list
deb-src http://us.ports.ubuntu.com/ubuntu-ports/ bionic main
deb-src http://us.ports.ubuntu.com/ubuntu-ports/ bionic-updates main

$ apt-get source linux-image-$(uname -r)
Reading package lists... Done
Picking 'linux' as source package instead of 'linux-image-4.15.0-54-generic'
NOTICE: 'linux' packaging is maintained in the 'Git' version control system at:
git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/bionic
Please use:
git clone 
git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/bionic
to retrieve the latest (possibly unreleased) updates to the package.
Skipping already downloaded file 'linux_4.15.0-54.58.dsc'
Skipping already downloaded file 'linux_4.15.0.orig.tar.gz'
Skipping already downloaded file 'linux_4.15.0-54.58.diff.gz'
Need to get 0 B of source archives.
Skipping unpack of already unpacked source in linux-4.15.0
$

Did you do the required "apt update" after modifying the sources.list
file - to update the local archive package index?

But 'klebers' will share the sources he used ...

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https://bugs.launchpad.net/bugs/1828166

Title:
  perf top problem on z with Ubuntu 18.04

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