I am facing a problem on installation of OpenFOAM.I am a beginner.I need to learn this for doing a simulation.But the problem is it has become difficult to install OpenFOAM.I have tried by using Ubuntu software center.
After searching OpenFOAM there comes an installation option.But when I am trying to install it is showing
Requires installation of untrusted packages
and in the details section it is showing
binutils-dev blcr-util csh flex g++ g++-4.7 libcr0 libfl-dev libibverbs-dev libibverbs1 libice-dev libopenmpi-dev libopenmpi1.3 libpthread-stubs0 libpthread-stubs0-dev libptscotch-5.1 libptscotch-dev libreadline-dev libreadline6-dev libscotch-5.1 libscotch-dev libsigsegv2 libsm-dev libstdc++6-4.7-dev libtinfo-dev libtorque2 libx11-6 libx11-dev libx11-doc libxau-dev libxcb1 libxcb1-dev libxdmcp-dev libxt-dev libxt6 m4 mpi-default-dev openfoam221 openmpi-bin openmpi-checkpoint openmpi-common x11proto-core-dev x11proto-input-dev x11proto-kb-dev xorg-sgml-doctools xtrans-dev zlib1g-dev
Then I tried to install by using terminal from this link http://www.openfoam.org/download/ubuntu.php
VERS=$(lsb_release -cs) sudo sh -c "echo deb http://www.openfoam.org/download/ubuntu $VERS main > /etc/apt/sources.list.d/openfoam.list"
then I entered
sudo apt-get update
Reading package lists... Done
then I entered
$ sudo apt-get install openfoam230 35 upgraded, 85 newly installed, 0 to remove and 290 not upgraded. Need to get 31.7 MB/199 MB of archives. After this operation, 752 MB of additional disk space will be used. Do you want to continue [Y/n]?
Then I wrote
WARNING: The following packages cannot be authenticated! openfoam230 Install these packages without verification [y/N]?
Y, it shows
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
At this step what should I do?Please suggest me.Thanks in advance