[Lazarus] Screwed up Lazarus installation - how to make clean and start over?

[Ondrej Pokorny]

On 22.02.2023 18:01, Bo Berglund via lazarus wrote:
> On Wed, 22 Feb 2023 10:43:35 +0100, Bo Berglund via lazarus
> <lazarus at lists.lazarus-ide.org> wrote:
>
>> Lacking any advice here I started over by removing the old Lazarus directory and
>> the pcp dir and then build from start with a new set of source files in a fresh
>> 2.2.4 subdir...
>>
>> All was Ok until again the OLPM packages were installed when the new Lazarus
>> also failed to start. It seems like at least one of the packages I use from OLPM
>> will hose Lazarus!
>>
>> So now I will repeat the effort but this time I will install one package after
>> another using OLPM and rebuild Lazarus IDE after each. This way I would be able
>> to pinpoint the one that causes the problem.
> So now I have found a package in OnLinePackageManager that will hose Lazarus if
> installed:
>   BGRABitmap
>
> Up until installing that I was fine, but now Lazarus won't start....
>
> The Initial image is shown for 3 seconds and then disappears.
> Then nothing...
>
> What can I do to get into Lazarus and remove the BGRABitmap?
>
> Or is there somewhere a file or such I can edit and then rebuild the IDE from
> the command line?
>
> This is on Linux (Raspberry Pi  OS).

Usually there is an "old" Lazarus executable (lazarus.old) next to the 
Lazarus executable. I usually switch to that if something is wrong with 
the new one. A problem arises if the old exe doesn't work either because 
it has been overwritten etc. Try it, that might be the quickest help.

Ondrej