Same problem here on a fresh 16.04 install.
I had to apt-get install php-mbstring php7.0-mbstring php-gettext
libapache2-mod-php7.0
and then restart apache.
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** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/8150205/Dependencies.txt
** Attachment added: "ProcMaps.txt"
http://launchpadlibrarian.net/8150206/ProcMaps.txt
** Attachment added: "ProcStatus.txt"
http://launchpadlibrarian.net/8150207/ProcStatus.txt
** Attachment
Public bug reported:
Binary package hint: ubiquity
installing vanilla feisty fawn kubuntu over a feisty fawn ubuntu (after
due backup) to try out KDE (and KDE4)
i switch to alternate kubuntu install.
ProblemType: Crash
Architecture: i386
Date: Thu Jun 21 09:16:04 2007
DistroRelease: Ubuntu 7.04