You need to apt-get update...or you have an AV solution blocking the file from being downloaded.

i did apt-get update and i don't even have an AV
and it failed cause the package was not found, not because anything else

actually i can see in http://http.kali.org/kali/pool/main/m/metasploit-framework

metasploit-framework_4.11.5-2015120901-0kali1_amd64.deb
metasploit-framework_4.11.5-2015121501-0kali1_amd64.deb
metasploit-framework_4.11.5-2015121501-0kali1~r1u1_amd64.deb
and my metasploit is 2015113001-0kali1~r1u1_amd64.deb

i could download and dpkg manually but i fear i will break something

metasploit-framework 4.11.5-2015120901-0kali1~r1u1.deb doesn't exist

It is an old and outdated version - check http://http.kali.org/kali/pool/main/m/metasploit-framework/
Make sure you apt-get update first. If this is still an issue, perhaps we are dealing with a stale repository, although that doesn't make much sense.

i did apt-get update then apt-get upgrade many times

metasploit is the only broken package ,other packages/programs are upgraded normally

should i download"" metasploit-framework_4.11.5-2015121501-0kali1~r1u1_amd64.deb"" and dpkg it manually for now
"dpkg -i" ??? Thanks

No, better we get to the bottom of this, as updating metasploit works perfectly for me. Can you show me the output of :

curl -sI http://http.kali.org/README

HTTP/1.1 302 Found
Date: Tue, 22 Dec 2015 14:31:06 GMT
Server: Apache/2.4.10 (Debian)
X-MirrorBrain-Mirror: kali.mirror.garr.it
X-MirrorBrain-Realm: other
Link: <http://http.kali.org/README.meta4>; rel=describedby; type="application/metalink4+xml"
Link: <http://kali.mirror.garr.it/mirrors/kali/README>; rel=duplicate; pri=1; geo=it
Link: <http://archive-3.kali.org/kali/README>; rel=duplicate; pri=2; geo=de
Link: <http://ftp.halifax.rwth-aachen.de/kali/README>; rel=duplicate; pri=3; geo=de
Link: <http://ftp.belnet.be/kali/kali/README>; rel=duplicate; pri=4; geo=be
Link: <http://ftp.free.fr/pub/kali/README>; rel=duplicate; pri=5; geo=fr
Location: http://kali.mirror.garr.it/mirrors/kali/README
Content-Type: text/html; charset=iso-8859-1

I just remembered
I tried doing msfupdate and i could see that i am downloading but nothing was shown on the terminal as downloading or even any action so i aborted, rebooted and then apt-get update
but i did that before and nothing broke

I'm Having the same issue on multiple machines, the A\V was blocking part of the update, but even disabling the A\V, reboot kali and trying to update gave the same issue.

Trying to update using msfupdate gave the following output:

[]
[] Attempting to update the Metasploit Framework...
[*]

[] Checking for updates via the APT repository
[] Note: expect weekly(ish) updates using this method
[*] Updating to version 4.11.5-2015120901-0kali1~r1u1
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
metasploit-framework
1 upgraded, 0 newly installed, 0 to remove and 29 not upgraded.
Need to get 58.3 MB of archives.
After this operation, 36.9 kB of additional disk space will be used.
Err http://http.kali.org/kali/ sana/main metasploit-framework i386 4.11.5-2015120901-0kali1~r1u1
404 Not Found
E: Failed to fetch http://http.kali.org/kali/pool/main/m/metasploit-framework/metasploit-framework_4.11.5-2015120901-0kali1~r1u1_i386.deb 404 Not Found

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

I tried a new machine that was not interrupted by the A\V before, and I got the same error

Fetched 55.1 MB in 1min 32s (596 kB/s)
E: Failed to fetch http://http.kali.org/kali/pool/main/m/metasploit-framework/metasploit-framework_4.11.5-2015120901-0kali1~r1u1_i386.deb 404 Not Found

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

I never had an AV

I disabled kali.mirror.garr.it until I can check the status of this mirror. They made some changes recently, nothing was supposed to break but it looks like it did not work well.

kali.mirror.garr.it has been fixed.