[Bug 1812258] [NEW] Bionic amd64 netboot image has incorrect permissions on kernel

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Bionic's amd64 netboot image has changed permissions on the included
kernel that breaks many tftp daemon configurations. The permissions of
'ubuntu-installer/amd64/linux' contained in netboot.tar.gz for bionic
are 0600, however they should be 0644, which matches read permissions on
all files in netboot.tar.gz. Prior releases and the current cosmic
release all follow these other read permissions on all files in
netboot.tar.gz.

Because many tftp daemons run as a different user than the owner of
files being served, permitting read from other on this file (and
additional files required for netboot) is necessary to allow access and
ultimately to PXE boot the image.

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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Bionic amd64 netboot image has incorrect permissions on kernel
https://bugs.launchpad.net/bugs/1812258
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