Comment 0 for bug 1877088

When testing development kernels I usually rely on the installkernel
script either through the "make install" target of the Kernel source
or manually. This used to work great on Ubuntu on Z.

On Ubuntu 20.04 (freshly installed up to date) this fails however because
/boot/initrd.img is not updated (/boot/vmlinuz is) and thus zipl installs the
wrong kernel/initrd combination rendering the system unbootable.

(with the correct modules already copied to /usr/lib/modules/5.7.0-rc4-06500-gb67ea026badd/)
# sudo installkernel 5.7.0-rc4-06500-gb67ea026badd bzImage System.map /boot
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 5.7.0-rc4-06500-gb67ea026badd /boot/vmlinuz-5.7.0-rc4-06500-gb67ea026badd
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 5.7.0-rc4-06500-gb67ea026badd /boot/vmlinuz-5.7.0-rc4-06500-gb67ea026badd
update-initramfs: Generating /boot/initrd.img-5.7.0-rc4-06500-gb67ea026badd
Using config file '/etc/zipl.conf'
Building bootmap in '/boot'
Building menu 'menu'
Adding #1: IPL section 'ubuntu' (default)
Adding #2: IPL section 'old'
Preparing boot device: dasda (3844).
Done.
run-parts: executing /etc/kernel/postinst.d/zz-zipl 5.7.0-rc4-06500-gb67ea026badd /boot/vmlinuz-5.7.0-rc4-06500-gb67ea026badd
Using config file '/etc/zipl.conf'
Building bootmap in '/boot'
Building menu 'menu'
Adding #1: IPL section 'ubuntu' (default)
Adding #2: IPL section 'old'
Preparing boot device: dasda (3844).
Done.
# ls -l /boot
total 178364
-rw------- 1 root root 135168 May 6 11:52 bootmap
-rw-r--r-- 1 root root 90471 Apr 29 15:34 config-5.4.0-29-generic
lrwxrwxrwx 1 root root 27 May 6 11:40 initrd.img -> initrd.img-5.4.0-29-generic <====== should point to new version
-rw-r--r-- 1 root root 19663996 May 6 11:42 initrd.img-5.4.0-29-generic
-rw-r--r-- 1 root root 125339494 May 6 11:52 initrd.img-5.7.0-rc4-06500-gb67ea026badd
lrwxrwxrwx 1 root root 27 May 6 11:40 initrd.img.old -> initrd.img-5.4.0-29-generic
-rw------- 1 root root 3087920 Apr 29 15:34 System.map-5.4.0-29-generic
-rw-r--r-- 1 root root 4031691 May 6 11:52 System.map-5.7.0-rc4-06500-gb67ea026badd
-rw-r--r-- 1 root root 4031691 May 6 11:49 System.map-5.7.0-rc4-06500-gb67ea026badd.old
lrwxrwxrwx 1 root root 37 May 6 11:52 vmlinuz -> vmlinuz-5.7.0-rc4-06500-gb67ea026badd
-rw------- 1 root root 8086072 Apr 29 15:54 vmlinuz-5.4.0-29-generic
-rw-r--r-- 1 root root 9080832 May 6 11:52 vmlinuz-5.7.0-rc4-06500-gb67ea026badd
-rw-r--r-- 1 root root 9080832 May 6 11:49 vmlinuz-5.7.0-rc4-06500-gb67ea026badd.old
lrwxrwxrwx 1 root root 41 May 6 11:52 vmlinuz.old -> vmlinuz-5.7.0-rc4-06500-gb67ea026badd.old