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I have a relatively new install of Ubuntu 12.04. The php version is 5.3, so I just followed this question to upgrade to 5.5: How do I install different (upgrade or downgrade) PHP version in still supported Ubuntu release?

When I ran the final command though (sudo apt-get upgrade), it gave me the following output:

Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: apache2 apache2-mpm-prefork apache2.2-bin libapache2-mod-php5 libjson0 php5-cli php5-common php5-mysql 0 upgraded, 0 newly installed, 0 to remove and 8 not upgraded.

Why does it 'keep packages back'?

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  • It can be beacuse their dependencies cannot be met or installing them will unistall something else non-repleaceble with new versions of same package. What does it answer when you try to install them manually?
    – dadexix86
    Aug 25, 2013 at 9:16

1 Answer 1

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Try:

sudo apt-get dist-upgrade

More info here:
Why use apt-get upgrade instead of apt-get dist-upgrade?

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