Comment 4 for bug 1663876

To clarify my above comment, the symlinks all point to "../linux-lts-zesty-headers-4.10.0-7/" locations that do not exist, so each and every symlink is in fact broken. :

 /usr/src/linux-headers-4.10.0-7-generic $ ls -l
total 1436
drwxr-xr-x 3 root root 4096 Feb 12 12:15 arch
lrwxrwxrwx 1 root root 41 Feb 6 17:14 block -> ../linux-lts-zesty-headers-4.10.0-7/block
lrwxrwxrwx 1 root root 41 Feb 6 17:14 certs -> ../linux-lts-zesty-headers-4.10.0-7/certs
lrwxrwxrwx 1 root root 42 Feb 6 17:14 crypto -> ../linux-lts-zesty-headers-4.10.0-7/crypto
lrwxrwxrwx 1 root root 49 Feb 6 17:14 Documentation -> ../linux-lts-zesty-headers-4.10.0-7/Documentation
lrwxrwxrwx 1 root root 43 Feb 6 17:14 drivers -> ../linux-lts-zesty-headers-4.10.0-7/drivers
lrwxrwxrwx 1 root root 44 Feb 6 17:14 firmware -> ../linux-lts-zesty-headers-4.10.0-7/firmware
lrwxrwxrwx 1 root root 38 Feb 6 17:14 fs -> ../linux-lts-zesty-headers-4.10.0-7/fs
drwxr-xr-x 4 root root 4096 Feb 12 12:15 include
lrwxrwxrwx 1 root root 40 Feb 6 17:14 init -> ../linux-lts-zesty-headers-4.10.0-7/init
lrwxrwxrwx 1 root root 39 Feb 6 17:14 ipc -> ../linux-lts-zesty-headers-4.10.0-7/ipc
lrwxrwxrwx 1 root root 42 Feb 6 17:14 Kbuild -> ../linux-lts-zesty-headers-4.10.0-7/Kbuild
lrwxrwxrwx 1 root root 43 Feb 6 17:14 Kconfig -> ../linux-lts-zesty-headers-4.10.0-7/Kconfig
drwxr-xr-x 2 root root 4096 Feb 12 12:15 kernel
lrwxrwxrwx 1 root root 39 Feb 6 17:14 lib -> ../linux-lts-zesty-headers-4.10.0-7/lib
lrwxrwxrwx 1 root root 44 Feb 6 17:14 Makefile -> ../linux-lts-zesty-headers-4.10.0-7/Makefile
lrwxrwxrwx 1 root root 38 Feb 6 17:14 mm -> ../linux-lts-zesty-headers-4.10.0-7/mm
-rw-r--r-- 1 root root 1442017 Feb 6 17:14 Module.symvers
lrwxrwxrwx 1 root root 39 Feb 6 17:14 net -> ../linux-lts-zesty-headers-4.10.0-7/net
lrwxrwxrwx 1 root root 43 Feb 6 17:14 samples -> ../linux-lts-zesty-headers-4.10.0-7/samples
drwxr-xr-x 6 root root 12288 Feb 12 12:15 scripts
lrwxrwxrwx 1 root root 44 Feb 6 17:14 security -> ../linux-lts-zesty-headers-4.10.0-7/security
lrwxrwxrwx 1 root root 41 Feb 6 17:14 sound -> ../linux-lts-zesty-headers-4.10.0-7/sound
lrwxrwxrwx 1 root root 39 Feb 6 17:14 spl -> ../linux-lts-zesty-headers-4.10.0-7/spl
lrwxrwxrwx 1 root root 41 Feb 6 17:14 tools -> ../linux-lts-zesty-headers-4.10.0-7/tools
lrwxrwxrwx 1 root root 42 Feb 6 17:14 ubuntu -> ../linux-lts-zesty-headers-4.10.0-7/ubuntu
lrwxrwxrwx 1 root root 39 Feb 6 17:14 usr -> ../linux-lts-zesty-headers-4.10.0-7/usr
lrwxrwxrwx 1 root root 40 Feb 6 17:14 virt -> ../linux-lts-zesty-headers-4.10.0-7/virt
lrwxrwxrwx 1 root root 39 Feb 6 17:14 zfs -> ../linux-lts-zesty-headers-4.10.0-7/zfs