i following this article to custom my ubuntu 16.04 and 12.04 https://help.ubuntu.com/community/In...apt-ftparchive

the good news is i have create a custom 12.04 successfully , but when i use the same way to create custom 16.04 , i failed, the error i got is some like that


i can not figure out why custom iso can find my gpg public keyring, because i pretty sure have repacakge the ubuntu-keyring_xxxx deb and udeb , and put them to the path pool/main/u/ubuntu-keyring/

from this error , ubuntu 16.04 installation was not able to update source list from my cdrom. which meanwhile , the "select pacakge and software" will not be installed , include the grub-install.

any body meet this error before ?

I found a solution by searching google,

installation customization will skip verifying the file in dists/xenial/Release by deleting the Release.gpg , and the processs will keep going .

but it is not the good way to skip check the vaildation of the Release file .

any update ?