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I'm unable to upgrade 15.04 to 16.04 LTS. Support has ended and all codes to edit sources.list have failed to work. I cannot use gksu since I don't have it and I'm unable to install it from software center or terminal. sed commands have also not worked. Software&updates is just repeating Failed to download repository even after making changes given here:
How to install software or upgrade from an old unsupported release?

Output of trying to install gksu:

gksudo gedit /etc/apt/sources.list
The program 'gksudo' is currently not installed. You can install it by typing:
sudo apt-get install gksu
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package gksu is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or is only available from another source

E: Package 'gksu' has no installation candidate`

Output of sed command: 

sudo sed -i.bak 's_ftp.iitb.ac.in/distributions/ubuntu/archives_http://old-releases.ubuntu.com_g‌​‌​' /etc/apt/sources.list
sed: -e expression #1, char 80: unknown option to `s'

and without 'g' 

sudo sed -i.bak  

's_ftp.iitb.ac.in/distributions/ubuntu/archives_http://old-releases.ubuntu.com_​‌​‌​‌​' /etc/apt/sources.list
sed: -e expression #1, char 79: unknown option to s'
Community
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Rana Divyank Chaudhary
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  • Can you add to your question the details of the error messages you see in the terminal? – edwinksl Jul 11 '16 at 15:29
  • @edwinksl I have added the outputs in the question. The graphical method given here www.askubuntu.com/a/311010/320386 didn't help either. – Rana Divyank Chaudhary Jul 11 '16 at 16:47
  • You don't have to edit sources.list file in graphical mode. you can do it in terminal. just use sudo nano /etc/apt/sources.list. I recommend you to do a fresh install instead of an upgrade. If you have to do a upgrade to last version you can use sudo do-release-upgrade and if it's telling you there is no new version then use: sudo do-release-upgrade -d let me know if it's worked for you. then I'll post it as an answer ;) – Ravexina Jul 11 '16 at 16:56
  • Actually, the do-release-upgrade commands had not worked earlier either. But, since we managed to fix my usb, I did a fresh install. :) Thanks! – Rana Divyank Chaudhary Jul 12 '16 at 00:01
  • To close and re-open voters: Why is a question about a release upgrade closed as off topic for being about an EOL release? – David Foerster Jul 12 '16 at 10:04
  • @DavidFoerster Personally, I may be in favor of re-opening the question. But a better solution would be to to fix the answers in the other question, so this confusion won't happen again. IMO, the problem is that, the answers in the other question offer the use of gksu which is no longer installed by default. – Dan Jul 12 '16 at 13:06
  • @RanaDivyankChaudhary I understand you're problem is gone now, but just fyi. Your problem with the sed command is that it is wrong. You should have used the one provided in the accepted answer of the question you have linked in your post. – Dan Jul 12 '16 at 13:08
  • @DavidFoerster the path 15.04->16.04 is never supported. – guntbert Jul 12 '16 at 14:25
  • @guntbert: Sure, but that the lack of support for the upgrade path is obviously not the reason for the failure of the release upgrade procedure. The same issue would have occurred for a supported upgrade path. – David Foerster Jul 12 '16 at 14:39
  • @Dan I guess so. But when I tried the accepted answer I linked, it did not work as far as i remember. Thanks though! – Rana Divyank Chaudhary Jul 13 '16 at 11:17
  • @RanaDivyankChaudhary, I have modified my answer on the linked question. Now you don't need to use gksudo anymore.. – Aditya Jul 17 '16 at 14:02

2 Answers2

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Use sudo nano /etc/apt/sources.list. It will open the file in an editor in the terminal window. It works like a GUI editor, except that the mouse doesn't work and you use the arrow keys to move around.

With nano, commands are listed on the bottom, where ^ means Ctrl. So, to save or Write Out the file, you press Ctrl+O, and to exit, you press Ctrl+X.

Olathe
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After the g at the end of your sed command are some weird non-printable characters when I copy & paste it. The hexadecimal representation of the UTF-8 encoded characters looks like this (67 being the UTF-8 encoded letter g):

67 e2 80 8c e2 80 8b e2 80 8c e2 80 8b

(Further investigation revealed them to be 2 zero with space (U+200B) and 2 zero with non-joiner (U+200C) characters.)

Please delete these characters and try again. Placing the terminal cursor after the g, pressing Backspace and re-entering g did it for me.

David Foerster
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