"libreadline.so.6: undefined symbol: UP" error prevents apt from upgrading

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http://askubuntu.com – May somebody give me a tip about problem? sh@sh-R528-R728:~/qt/test-build-desktop$ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: linux-generic linux-headers-generic linux-image-generic The following packages will be upgraded: apt-transport-https apt-utils chromium-browser chromium-browser-l10n chromium-codecs-ffmpeg gzip libapt-inst1.3 linux-libc-dev multiarch-support python-pam tzdata tzdata-java xserver-xorg-video-openchrome 13 upgraded, 0 newly installed, 0 to remove (HowTos)