Fixed 404 error

[Agvantibo]

In issue #124 the problem was '404 on tar.gz download'. Now I have updated the link to a working one.

[ghost]

ubuntu.sh
$ bash ubuntu.sh
downloading ubuntu-image
--2020-08-04 14:08:13-- https://partner-images.canonical.com/core/disco/current/ubuntu-disco-core-cloudimg-arm64-root.tar.gz
Resolving partner-images.canonical.com... 91.189.88.147
Connecting to partner-images.canonical.com|91.189.88.147|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2020-08-04 14:08:13 ERROR 404: Not Found.

decompressing ubuntu image
tar: This does not look like a tar archive

gzip: stdin: unexpected end of file
tar: Child returned status 1
tar: Error is not recoverable: exiting now
fixing nameserver, otherwise it can't connect to the internet
ubuntu.sh: line 33: etc/resolv.conf: No such file or directory
writing launch script
fixing shebang of start-ubuntu.sh
making start-ubuntu.sh executable
You can now launch Ubuntu with the ./start-ubuntu.sh script
$

[Agvantibo]

Check the link, it should be bionic, not disco

[ghost]

./start-ubuntu.sh
groups: cannot find name for group ID 3003
groups: cannot find name for group ID 9997
groups: cannot find name for group ID 20120
groups: cannot find name for group ID 50120

[jsrobson10]

Should be focal now

[dennisvanderpool]

I just made a similar fix. Would be nice if repo owner could approve the pull requests?