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Segmentation fault when updating Kali Linux 2.0 Sana - blackMORE Ops -4
How toKali LinuxSecurity

Segmentation fault when updating Kali Linux 2.0 Sana

by blackMOREOps
written by blackMOREOps

Most of you already know that Kali Linux 2.0 (Kali Sana) was released yesterday 11-Aug-2015 1444hrs EST. Like everyone else I tried to jump into the bandwagon and tried to install Kali Linux 2.0 Sana and immediately experienced slow update issues. I later ran into Segmentation fault error when trying to do an apt-get update. This post will discuss some recent event that I’ve observed as well as fixing Segmentation fault error in Kali Sana 2.0 when trying to update. Segmentation fault when updating Kali Linux 2.0 Sana - blackMORE Ops -4

First of all, I think it has to be mentioned that what a fantastic job Kali dev team did. Kali Linux 2.0 Sana looks and feels fantastic and very smooth even in VirtualBox. I am also very happy with the number of torrent seeders and I managed to download all 3 flavors of amd64 Kali Linux 2.0 Sana (kali-linux-2.0-amd64.iso, kali-linux-light-2.0-i386.iso and kali-linux-mini-2.0-amd64.iso) within 20 minutes using torrent. I was getting about 40Mbps download speed  and my upload speed was around 20Mbps (it can go upto 40Mbps). That’s a total of 3.8GB and I decided to contribute back and allowed seeding upto 18GB. (6.09 ratio). Do seed if your ISP allows it.

Anyhow, my point being, Kali is now more popular (I was getting 20Kbps when I downloaded Kali 1.0) and more and more people are using it. Those who managed to download it, I am sure they are as excited as I am but also ran into the same issues that I’ve faced. The main issue being slow apt-get update or a 404 error message when trying to do apt-get update. It’s not only because everyone is trying to download updates but also because of DDoS attack against Kali servers and mirrors. Here’s the Twitter post that I shared yesterday in my Facebook page and Twitter

That will definitely slow your downloads. We discussed about how to improve download speed by changing mirrors manually before which might be an option if you live in a region where only few mirrors are available. But this also created another problems when you try to install Kali Linux 2.0 Sana. One particular problem is what I’ve experienced: [Correction: Do NOT use repo.kali.org  as it’s not for Sana, I will try to get an update on that.]


Slow updates created another issue when you try to install Kali Linux 2.0 Sana. One particular problem is what I’ve experienced:

Segmentation fault when updating Kali Linux 2.0 Sana

root@kali:~# 
root@kali:~# apt-get update
Segmentation fault
Reading package lists... Done
root@kali:~#

Segmentation fault when updating Kali Linux 2.0 Sana - blackMORE Ops -1This possibly happened because when I tried to install Kali Linux 2.0 Sana, during auto-update (installation update phase) it timed out due to 404 Errors and I had to cancel the update manually to complete my installation.

Fixing Segmentation fault when updating Kali Linux 2.0 Sana

I found that the easiest way to fix is to open your sources.list file and modify it. When I opened my sources.list file, following is what I found:

# Line commented out by installer because it failed to verify:

Full sources.list below:

#

# deb cdrom:[Debian GNU/Linux 2.0 _Sana_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150811-08:02]/ sana contrib main non-free

#deb cdrom:[Debian GNU/Linux 2.0 _Sana_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150811-08:02]/ sana contrib main non-free

# Line commented out by installer because it failed to verify:
#deb https://security.kali.org/kali-security/ sana/updates main contrib non-free
# Line commented out by installer because it failed to verify:
#deb-src https://security.kali.org/kali-security/ sana/updates main contrib non-free

Segmentation fault when updating Kali Linux 2.0 Sana - blackMORE Ops -2

Well that makes sense, it’s probably better this way rather waiting endlessly for update. You need to modify your sources.list file, remove all existing lines and put the followings instead:

root@kali:~# vi /etc/apt/sources.list
(or)
root@kali:~# leafpad /etc/apt/sources.list

Copy paste the following repositories (remove existing lines). This was taken from official Kali sources.list Repositories list.

# Regular repositories
deb https://http.kali.org/kali sana main non-free contrib
deb https://security.kali.org/kali-security sana/updates main contrib non-free
# Source repositories
deb-src https://http.kali.org/kali sana main non-free contrib
deb-src https://security.kali.org/kali-security sana/updates main contrib non-free

Save the file and then run apt-get update as normal.

root@kali:~# apt-get update
Get:1 https://security.kali.org sana/updates InRelease [11.9 kB]
Ign https://security.kali.org sana/updates/contrib Translation-en_AU            
Ign https://security.kali.org sana/updates/contrib Translation-en        
Ign https://security.kali.org sana/updates/main Translation-en_AU        
Ign https://security.kali.org sana/updates/main Translation-en           
Ign https://security.kali.org sana/updates/non-free Translation-en_AU    
Ign https://security.kali.org sana/updates/non-free Translation-en       
100% [Connecting to ftp.cc.uoc.gr (147.52.159.12)]

Conclusion

I will slowly update and add more fixes as I go. It’s definitely tough for me to test everything alone, so please be patient when I can’t respond back to your issues fast enough. Alternatively, I am sure Kali forums would be able to help immensely.

If you’ve found a serious issue that you think makes Kali Linux 2.0 Sana unstable and needs  immediate fix, report it via Kali Bugs pages.

Feel free to comment, report other issues, fixes via comments section. As always, my comments section remains free and anonymous (as much I could). You don’t need to register or validate anything and can use pseudonyms to post comments. Thanks for reading, do share if you feel the community should know about it.

Lastly,

I would like to thank everyone at Kali Dev team again for a fantastic product launch. And if I may be bold enough to say this, “For a Penetration test Linux distro, this can only be compared with iPhone launch.” Well done.

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How to fix Kali apt-get slow update - blackMORE Ops
How toKali LinuxLinux

How to fix Kali Linux apt-get slow update?

by blackMOREOps
written by blackMOREOps

This is a small guide on How to fix Kali Linux apt-get slow update.
How to fix Kali apt-get slow update - blackMORE Ops
Kali is relatively new and got fewer Mirrors than some other distro’s. That means less servers to download from and less servers means more people trying to download from them and using all bandwidth. So when you type in apt-get update, you see a slow download speed for packages. This just means you’re connected to a server that’s really busy. Some users complains that nothing happens or they are not getting any updates at all. Some got different issues like update stuck is header and doesn’t move any further.

To fix this, you need to check a few things:

  1. Check if you have the right repositories is your /etc/apt/sources.list
  2. Remove unwanted or unsupported repositories.
  3. Clean apt-get cache.
  4. Choose a fast DNS server.

To fix sources.list, follow this guide: How to add official Kali Linux Repositories?

To switch repositories to a different mirror of your choice, follow this guide: How to change repositories to a different mirror?

Clean apt-get cache:

apt-get clean

Choose a proper DNS server:

Edit resolv.conf file:

leafpad /etc/resolv.conf

Enter Google DNS nameservers

Following two are Google DNS, let’s face it, if Google is broken, we all think Internet is broken. Hence the reason of using Google DNS. You can choose other DNS Server if you want that are fast and reliable.

nameserver 8.8.8.8
nameserver 8.8.4.4

Now save and close the file.

Test your changes

Let put our changes to the test..

Do an apt-get update

 apt-get update

Do and upgrade

 apt-get upgrade

Finally do a distribution upgrade

 apt-get dist-upgrade

Your download speed should be a lot better than you were getting previously.

Another solution, changing from HTTP to REPO in sources.list file (14/02/2014)

One of the readers advised that by changing the repositories from HTTP to REPO, he gained significant speed up. See Sameer Barha’s comment below.

Use the following repositories (update your sources.list file)

## Kali Regular repositories
deb https://repo.kali.org/kali kali main non-free contrib
deb https://security.kali.org/kali-security kali/updates main contrib non-free
## Kali Source repositories
deb-src https://repo.kali.org/kali kali main non-free contrib
deb-src https://security.kali.org/kali-security kali/updates main contrib non-free

Instead of

## Kali Regular repositories
deb https://http.kali.org/kali kali main non-free contrib
deb https://security.kali.org/kali-security kali/updates main contrib non-free
## Kali Source repositories
deb-src https://http.kali.org/kali kali main non-free contrib
deb-src https://security.kali.org/kali-security kali/updates main contrib non-free

This change seems to boost speed as it uses slightly different repo than the usual HTTP servers which are overloaded. Let us know how this worked for you.

In case your sources.list file is messed up or you’re just not sure, what to put on there, follow these instruction’s to add official Kali Linux Repositories.

(Note: The above mentioned repositories are a slightly variant of the official one, you can choose either as they are both from Kali.org)

In case your DNS server is picking up (even Google’s DNS server) a repository from a different country(or avoid a specific country) and you would like to manually switch repositories to a different mirror of your choice(say in same country or just something you know working faster, follow these instruction to change repositories to a different mirror.

Thanks for reading. Please comment your experience to make this guide better. If you’ve found this useful, share and follow us on Facebook/Twitter.

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