[Bug 2000274] Re: rust-all uses missing dependency llvm-14, cannot be installed.

[ChengEn, Du]

** Description changed:

- $ lsb_release -rd
- Description:	Ubuntu 20.04.5 LTS
+ [Impact]
+ rust-all cannot install because llvm-14 is unavailable on focal, which is one of its dependencies.
+ 
+ [Test Plan]
+ root at focal:~# lsb_release -rc
  Release:	20.04
- 
- $ apt-cache policy rust-all
- rust-all:
-   Installed: (none)
-   Candidate: 1.61.0+dfsg1~llvm-1~exp1ubuntu0.20.04.1
- 
- --
- 
- rust-all lists llvm-14 as one of its dependencies. 
- llvm-14 package is not available on a fresh focal install. 
- 
- Upon attempting to install rust-all, it fails with:
+ Codename:	focal
+ root at focal:~# apt install rust-all
+ Reading package lists... Done
+ Building dependency tree       
+ Reading state information... Done
+ Some packages could not be installed. This may mean that you have
+ requested an impossible situation or if you are using the unstable
+ distribution that some required packages have not yet been created
+ or been moved out of Incoming.
+ The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
   rust-all : Depends: llvm-14 but it is not installable
  E: Unable to correct problems, you have held broken packages.
  
- --
+ [Where problems could occur]
+ We need to modify the dependencies to solve this issue.
+ The regression can be considered as low.
  
- $ rmadison -a amd64 -s focal,focal-updates llvm-{8,9,10,11,12,13,14}
-  llvm-8  | 1:8.0.1-9                 | focal/universe         | amd64
-  llvm-9  | 1:9.0.1-12                | focal/universe         | amd64
-  llvm-10 | 1:10.0.0-4ubuntu1         | focal/universe         | amd64
-  llvm-11 | 1:11.0.0-2~ubuntu20.04.1  | focal-updates/universe | amd64
-  llvm-12 | 1:12.0.0-3ubuntu1~20.04.5 | focal-updates/universe | amd64
- 
- I managed to replicate the issue on a fresh focal VM in order to verify.
- 
- Thank you,
- Victor
+ [Other Info]

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https://bugs.launchpad.net/bugs/2000274

Title:
  rust-all uses missing dependency llvm-14, cannot be installed.

Status in rustc package in Ubuntu:
  Fix Released
Status in rustc source package in Bionic:
  Triaged
Status in rustc source package in Focal:
  Triaged

Bug description:
  [Impact]
  rust-all cannot install because llvm-14 is unavailable on focal, which is one of its dependencies.

  [Test Plan]
  root at focal:~# lsb_release -rc
  Release:	20.04
  Codename:	focal
  root at focal:~# apt install rust-all
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies:
   rust-all : Depends: llvm-14 but it is not installable
  E: Unable to correct problems, you have held broken packages.

  [Where problems could occur]
  We need to modify the dependencies to solve this issue.
  The regression can be considered as low.

  [Other Info]

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