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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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    Possible duplicate of 14.04.5 to 16.04 Update failed - xenial.tar.gz.gpg missing. Similar problem with different releases, could be a working solution for you. – Liso Apr 23 '19 at 06:57
  • I've tried to disable the apt-cacher according to this tutorial and then use apt-get update and apt-get upgrade but to no avail. :/ – LordAnomander Apr 23 '19 at 09:22
  • It seams your mirror does not provide the file disco-updates.tar.gz.gpg. Please change your mirror in /etc/apt/sources.list or show us the content of the file. A good list can be found at https://launchpad.net/ubuntu/+archivemirrors ... You'll can check if the file exist under the following path: http://mirror.waia.asn.au/ubuntu/dists/disco/main/dist-upgrader-all/current/ – LupusE Apr 23 '19 at 09:38
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    Regarding your Edit: The option -d stands for 'upgrade to development release'. (Source: http://manpages.ubuntu.com/manpages/bionic/man8/do-release-upgrade.8.html) ... This should not be the release you want. – LupusE Apr 23 '19 at 09:45
  • Now actually duplicate of the other question, it's a different problem, how do I ask to open this question? – iopq Jun 20 '20 at 11:06

2 Answers2

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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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