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How to update apt-get and import iso digital signature
1. Insert the system CD into the optical drive, enter the system and install it.

Mount/Develop /sr0/ Manage

2. Modify the apt-get source code and add the directory of the CD-ROM drive to the source code.

vim /etc/apt/sources.list

In the first line, add

Deb file: ///mnt trusted master file is limited.