hello friends i am using Kali Linux KDE and past week i upgraded my KDE
but now i have a problem when ever i want to install application with apt-get i get lots of problem
for example when i want install (etherape)

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sudo apt-get install etherape

i get

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W: Not using locking for read only lock file /var/lib/dpkg/lock-frontend
W: Not using locking for read only lock file /var/lib/dpkg/lock
E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem.


when i type (dpkg --configure -a)
i get

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dpkg: error: unable to access the dpkg database directory /var/lib/dpkg: Read-only file system

when i want to remount my partitation like
sudo mount -o remount,rw /
i get

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mount: /: cannot remount /dev/sda7 read-write, is write-protected.


thanks for your help