[Bug 1853586] [NEW] Cannot add locale CP1215 (lowcase)

[Terentev-mn]

Public bug reported:

I try add locale via saltstack. In salt's module locale name is normalizing, and
it will transform from 'CP1251' to 'cp1215'
When I tried aaply state, I got error: 
# Error: 'ru_RU.cp1251' is not a supported language or locale

Then I try manual do the same..
~# locale-gen ru_RU.cp1251
Error: 'ru_RU.cp1251' is not a supported language or locale
But upper case, all fine
~# locale-gen ru_RU.CP1251
Generating locales (this might take a while)...
  ru_RU.CP1251... done
Generation complete.

This affected on Ubuntu 16.04, 18.04

** Affects: glibc (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1853586

Title:
  Cannot add locale CP1215 (lowcase)

Status in glibc package in Ubuntu:
  New

Bug description:
  I try add locale via saltstack. In salt's module locale name is normalizing, and
  it will transform from 'CP1251' to 'cp1215'
  When I tried aaply state, I got error: 
  # Error: 'ru_RU.cp1251' is not a supported language or locale

  Then I try manual do the same..
  ~# locale-gen ru_RU.cp1251
  Error: 'ru_RU.cp1251' is not a supported language or locale
  But upper case, all fine
  ~# locale-gen ru_RU.CP1251
  Generating locales (this might take a while)...
    ru_RU.CP1251... done
  Generation complete.

  This affected on Ubuntu 16.04, 18.04

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