thanks beefstu pat-get install -f as root seemed to work for me !
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https://bugs.launchpad.net/bugs/1026069
Title:
package xul-ext-ubufox (not installed) failed to install/upgrade:
running apt-get install -f as root force installs the update and seems
to work fine after this
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https://bugs.launchpad.net/bugs/1026069
Title:
package xul-ext-ubufox (not installed)
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubufox (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1026069
Title:
Thank you for taking the time to report this bug and trying to help make
Ubuntu better. However, it seems that you are not using a software
package provided by the official Ubuntu repositories. Because of this
the Ubuntu project can not support or fix your particular bug. Please
report this bug
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https://bugs.launchpad.net/bugs/1026069
Title:
package xul-ext-ubufox (not installed) failed to install/upgrade:
trying to overwrite '/usr/share/xul-ext/ubufox/defaults/preferences