Cannot uninstall Language Pack 0 because it is not deployed

If you have this error, it means you are trying to uninstall a solution which is not installed (deployed).

So,
First check Central Administration - System Settings - Manage Farm Solutions - Check if your solution is deployed. If it is not, deploy it.

If you have trouble by deploying it, try to remove the solution. (Yeah, skip uninstall phase)

Removing solution PowerShell cmd:
Remove-SPSolution -Identity solution.wsp -Force
Removing solution stsadm cmd:
stsadm -o deletesolution -name solution.wsp -override

Add Solution PowerShell cmd:
Add-SPSolution D:\solution.wsp
Add Solution stsadm cmd:
stsadm.exe -o addsolution -filename D:\solution.wsp

Install Solution PowerShell cmd:
Install-SPSolution –Identity solution.wsp -GACDeployment -Force
Install Solution stsadm cmd:
stsadm -o deploysolution -name solution.wsp -immediate -allowCasPolicies -force -allowGacDeployment

Sharepoint 2010 Export all the solutions (wsp files)

Hi,

If you d like to get all the solutions (wsp files) from a sharepoint server and save them into a location, you just need the below code:

Open the Power Shell as Admin, type:

Add-PSSnapin Microsoft.SharePoint.PowerShell –erroraction SilentlyContinue 

## setup our output directory 

$dirName = "d:\exports\ExportedSolutions" 

Write-Host Exporting solutions to $dirName 

 foreach ($solution in Get-SPSolution) 

 { 

 $id = $Solution.SolutionID 

 $title = $Solution.Name 

 $filename = $Solution.SolutionFile.Name 

 Write-Host "Exporting ‘$title’ to …\$filename" -nonewline 

 try 

{ 

 $solution.SolutionFile.SaveAs("$dirName\$filename")

 Write-Host " – done" -foreground green 

 } 

 catch 

 {

 Write-Host " – error : $_" -foreground red 

 }

 }

You can change the output location as you want, it would save all the solutions.

Great time saver !

Cheers

PS: Sorry I forgot to give the source, but you can google it though.

Reinstall a WSP Package in Sharepoint 2010

Steps:
1. Retract
2. Delete Solution
3. Add Solution
4.Deploy Solution

1.Retract:
Go To Central Admin - System Settings - Manage Farm Solutions - Select and Retract the solution

2.Delete Solution:
Open PowerShell as Admin
Type
Remove-SPSolution –Identity YOUR_WSP_NAME.wsp

3.Add Solution:
Open 14 hive in cmd
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14
Run command:
stsadm.exe -o addsolution -filename D:\YOUR_WSP_NAME.wsp

4. Deploy Solution:
Go To Central Admin - System Settings - Manage Farm Solutions - Select and Deploy solution