Thanks for report this problem.
It seems that lemonpos has been fixed in version 0.9.1-0ubuntu1.1:
https://launchpad.net/ubuntu/+source/lemonpos/0.9.1-0ubuntu1.1
Please, enable Ubuntu Updates repository and update your system:
https://help.ubuntu.com/community/Repositories/Ubuntu#Ubuntu_Updates
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https://bugs.launchpad.net/bugs/905285
Title:
package lemonpos (not installed) failed to install/upgrade: trying to
overwrite '/usr/share/kde4/apps/squeeze/squeezeui.rc', which is
** Package changed: ubuntu = lemonpos (Ubuntu)
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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/905285
Title:
package lemonpos (not installed) failed to install/upgrade: trying to
overwrite
