For others having failed to install 5.4.2 and dont mind starting from scratch
with 5.4.1, here is a summary of the procedure on how to clean up after the
failed 5.4.2 install and how to install 5.4.1:
These lines completely purge xwiki including your pages(!) from your disk:
sudo apt-get remove --purge xwiki-enterprise-common
sudo mysql -u root -e "drop database xwiki"
sudo rm -rf /var/lib/xwiki
This line installs 5.4.1 without errors:
sudo apt-get install xwiki-enterprise-tomcat7-mysql=5.4.1
xwiki-enterprise-common=5.4.1 xwiki-enterprise-tomcat-common=5.4.1
xwiki-enterprise-mysql-common=5.4.1
sudo pico /etc/default/tomcat7
edit: JAVA_OPTS="-Djava.awt.headless=true -Xmx512m
-XX:MaxPermSize=192m -XX:+UseConcMarkSweepGC"
sudo /etc/init.d/tomcat7 restart
Visit
http://192.168.1.250:8080/xwiki to complete the install.
This can probably be followed by an upgrade to 5.4.2, but I am not certain
of the procedure. I do assume that it can be performed without having to
backup the contents of the wiki, i.e. you can do it whenever you like.
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