Fail and retry on "Some index files failed to download" #911
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APT doesn't error out even in the following case since it's a warning instead of an error. And it allows charms to move on without having a proper APT index and let them install unwanted versions of software for example. The apt_update part should fail if it's marked as fatal in such cases so that it can be retried or charm can raise it as an error to users appropriately.
"--error-on=any" is supported for >= bionic.
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1693900
Closes: #910
[w/o "--error-on=any"]
-> 0
[w/ "--error-on=any"]
-> 100