[Bug 1679652] [NEW] Using an ipv6 address as preseed file location results in an installer error

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Installer version: 20101020ubuntu500
Kernel: 4.10.0-14

Description/Reproduction:
Trying to perform an IPv6-based installation using a preseed file that should be retrieved from an IPv6 URL  results in this installer error:
"The file needed for preconfiguration could not be retrieved from
http://xxxxxxxxxxxxxxxx:10:100::86:49/ubuntu/name/zesty.preseed
The installation will proceed in non-automated mode."

The parameter in the parmfile looks like this:

preseed/url=http://[xxxxxxxxxxxxxx:10:100::86:49]/ubuntu/name/zesty.preseed

I also tried escaping the square brackets, but that also doesn't work

In syslog you see the following error:

Apr  4 10:22:22 main-menu[465]: (process:481): expr: warning: '^.*\[[:a-fA-F0-9]*\]': using '^' as the first character
Apr  4 10:22:22 main-menu[465]: (process:481): of a basic regular expression is not portable; it is ignored
Apr  4 10:22:22 main-menu[465]: (process:481): http://xxxxxxxxxxxxxxxx:10:100::86:49^G/ubuntu/name/zesty.preseed: Bad port number.

We had found a similar bug in Ubuntu 16.04
(https://bugzilla.linux.ibm.com/show_bug.cgi?id=137452 , Launchpad Bug
LP1547629)

I have attached the logs.

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-153142 severity-high targetmilestone-inin---
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Using an ipv6 address as preseed file location results in an installer error
https://bugs.launchpad.net/bugs/1679652
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