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It seems you are mixing sid with stable & also kali has it's own repos which shouldn't be mixed with debian.
If you want to add repos you need to go back to the kali docs page which will tell you which repos that you should use. If you're using kali comment out or remove the references to debian.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package linux-headers-generic is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'linux-headers-generic' has no installation candidate