64 bit - Installing 64-bit kernel in 32-bit Ubuntu 14.04 - Ask Ubuntu


i'm running ubuntu 14.04(32bit) on system , want use matlab(64bit). since ubuntu installation 32-bit i'm not able install matlab on it. i've read should able run 64-bit application in 32-bit ubuntu, if kernel 64-bit. have read this question , answer have saw these errors.

$ sudo dpkg --add-architecture amd64 $ sudo apt-get update   fetched 3,499 kb in 11s (304 kb/s)                                              reading package lists... done w: gpg error: http://ppa.launchpad.net trusty inrelease: following signatures couldn't verified because public key not available: no_pubkey 531ee72f4c9d234c w: duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_main_binary-amd64_packages) w: duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/restricted amd64 packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_restricted_binary-amd64_packages) w: duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/main i386 packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_main_binary-i386_packages) w: duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/restricted i386 packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_restricted_binary-i386_packages)   $ sudo apt-get install linux-image-amd64:amd64  reading package lists... done building dependency tree        reading state information... done e: unable locate package linux-image-amd64


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