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package installation error

Q. I’m trying to install a package using apt-get command. I’m getting warning message that read as follows:

Need to get 15.1MB of archives.
After unpacking 50.2MB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
libmono-sharpzip0.84-cil autopano-sift libpano12-0 libwxbase2.8-0 libwxgtk2.8-0 libpano12-bin libplot2c2 enblend
Install these packages without verification [y/N]?

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