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I'm currently on Ubuntu 18.10 and tried to upgrade to 19.04 via 

$ sudo do-release-upgrade -d
Checking for a new Ubuntu release
Get:1 Upgrade tool [1.214 kB]                                                                                                                                                      
Err Upgrade tool signature                                                                                                                                                         
  404  Not Found [IP: 91.189.91.23 80]                                                                                                                                             
Fetched 1.214 kB in 0s (0 B/s)                                                                                                                                                     
WARNING:root:file 'disco-updates.tar.gz.gpg' missing
Failed to fetch
Fetching the upgrade failed. There may be a network problem.

Network connection is fine, I don't have any outages. I'm not too experienced with using Ubuntu yet, so instead of tweaking files I thought I'd ask first.

Edit: I don't know why I though I should use -d, but leaving that out upgrading works.

LordAnomander
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2 Answers2

2

This fixed it for me:

sudo apt-get update --fix-missing; sudo dpkg --configure -a; sudo apt-get install -f; sudo apt-get update; sudo apt-get upgrade;
sudo do-release-upgrade

See https://ubuntuforums.org/showthread.php?t=2391552

If it doesnt't try

sudo mv /etc/apt/sources.list ~/
sudo touch /etc/apt/sources.list
software-properties-gtk

Check the first two boxes. You may also want to change the server. This recreates the source list.

See How do I restore the default repositories?

Marc Johnen
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as the new user you are, I would strongly recommend you not Upgrade your ubuntu and instead download ubuntu form here : https://www.ubuntu.com/download/desktop/thank-you?country=FR&version=19.04&architecture=amd64

then open up Usb creator :

ubuntu usb creator

and the rest is basically plug and play.

I recomend saving your data to somwhere new.

tatsu
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