
I try to install one of the deb packages, for example, apt-get install libwebp-dev_0.4.4-1_b, but I always get the error: Reading package lists. Note, selecting 'python-six' instead of './python-six_1.10.0-3_all.deb' Note, selecting 'python-sip' instead of './python-sip_4.17+dfsg-1build1_b' Note, selecting 'python-sip-dev' instead of './python-sip-dev_4.17+dfsg-1build1_b' Note, selecting 'python-setuptools' instead of './python-setuptools_20.7.0-1_all.deb' Note, selecting 'python-service-identity' instead of './python-service-identity_16.0.0-2_all.deb' Note, selecting 'python-serial' instead of './python-serial_3.0.1-1_all.deb' *.deb, lots of messages show up: Note, selecting 'python-rospkg' instead of './python-rospkg_1.1.4-100_all.deb'

I thought it should install the deb packages locally but to my surprise, it still redownload all deb files. Then I copy these deb files to the other system at /home/me/archives/ and execute apt-get install.

I execute several apt-get install XXX on one system and I can get the relative deb packages at /var/cache/apt/archives/. I have two Ubuntu system and they are exactly the same.
