16.04 - Permission denied though I'm sudo and have permission to file

Hi all,

I installed exFAT to be able to access SDCARDs formatted with this, and when installing from terminal I got this error:

Processing triggers for man-db (2.7.5-1) ...
/usr/bin/mandb: can't open /usr/man/man1/7zr.1.gz: Permission denied

And the installation continued.

I have seen this message before when installing, and I checked by re-installing from Synaptics, the same error occur there(in terminal).

I checked the file /usr/man/man1/7zr.1.gz and my User have full permission

Screenshot from synaptics atached.

Why am I getting this error?

My system is Peach OSI TW 16.04(I use my system for specific purpose and can't upgrade right now) - 64bit LTS - build on Xubuntu.

Kernel: 4.4.0-190-generic
DE: Xfce
WM: Xfwm4
Shell: bash 4.3.48

Thank you in advance

Jan
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