Lazarus 2.0.12 on Ubuntu 21.10 install error Dependency not satisfiable

[corradoventu]

Lazarus 2.0.12 on Ubuntu 21.10 install error Dependency not satisfiable fpc-laz(=3.2.0)
1st i installed Lazarus from Ubuntu repository install successful but does not work. removed and downloaded from https://sourceforge.net/projects/lazarus/
try to install with ubuntu software installed: error for  missing dependency.
retry install with gdebi: still Dependency not satisfiable.
see attachment.
thanks for suggestions

[lucamar]

Install fpc (and fpc-src) v3.2.0 before trying to install Lazarus. Lazarus 2.0.12 needs fpc 3.2.0 but AFAICT it's not yet in the standard package repos.

[corradoventu]

Ok, will use Lazarus on my Ubuntu 20.04 partition and wait for 21.10
thanks

[lucamar]

Why? You just have to download the three .deb from sourceforge and install them in order: first fpc-laz, then fpc-src and last lazarus-project.

[VTwin]

Installation of the three deb packages, as lucamar says, is very easy. There is no point in waiting until it shows up in the Ubuntu repository, which is unlikely to ever be up to date.

You may find some complex instructions for installing on Linux, but it is not really hard. You may need to install libgtk2.0-dev as well though.

Something like:

Code: [Select]

sudo apt-get install libgtk2.0-dev
sudo dpkg -i *.deb
should work. This assumes the 3 deb files are in the current directory using the terminal. You can use three calls to dpkg in order, but this call should do the same.

[mas steindorff]

lazy mans fix:

after using the GUI software to install Lazarus, all I do is ...

sudo apt upgrade lazarus

and all works. 

[MarkMLl]

You may find some very complex instructions for installing on Linux, but it is not really hard. You may need to install libgtk2.0-dev as well though.

Yes, I agree with that FWIW. It's also useful to install lib<some-database>-dev and libusb-dev to sort out symlinks that the OS doesn't do by default, although that might obscure problems that end users (who probably don't have the -dev packages) might experience.

There was recent discussion regarding the libqt5pas packages, where an FPC developer had unwisely started using some facilities which were unlikely to trickle into the released distreaux for some extended while.

My own SOP is to install the distro's prerequisite packages, then to compile FPC and Lazarus from scratch. It's worked for the last 15 years or so...

MarkMLl

[lucamar]

Unless things have gone very wrong with the Ubuntu repos (I'm still on 18.04 max. so I wouldn't know) either clicking on a .deb to  make  "software" install it or using Gdebi should work out of the box without having to go down to the command line: it should pull down any other needed dependancy like GTK2, etc.

I must confess that I always use the route of going through a local private repo ... but the few times that I've used Gdebi (for other things like FBReader, 4kDownloader, etc) it has worked w/out a flaw, pulling down any requirement without question.

Nevertheless, let me point out that using apt (or apt-get) in the command line should do exactly the same, resolving dependancies and installing the package(s).

The only problem here is that there is a dependency that can not be resolved because the system knows nothing about fpc[-laz|-src] 3.2.0; downloading and installing those first should solve it nicely.

[corradoventu]

I've found how download fpc-src https://sourceforge.net/projects/freepascal/ but not fpc-laz, may you help? thanks.

[dbannon]

Please have a look at https://wiki.freepascal.org/Installing_Lazarus_on_Linux

It has a link you to follow that takes you to the top of the Lazarus downloads, click on the " Lazarus Linux amd64 DEB" link, and then on "Lazarus 2.0.12" link. The files you need are there !

Do remember to install first FPC, then FPC_Src and then Lazarus. 

And, perhaps, if you don't mind, I'll suggest you read the wiki page I first mentioned.  You can get there by typing "Installing Lazarus" into the wiki search field.

Davo

[Zvoni]

And if you look further through this Sub-Forum, you'll find one common advice:

Don't use FPC/Lazarus from Distro-Repo's!
Especially the Ubuntu one......

Download the deb's from here (sourceforge). When i was still on Ubuntu/debian i used gdebi to install deb's, since gdebi resolves dependencies

nowadays i use fpcupdeluxe.....

[dbannon]

Don't use FPC/Lazarus from Distro-Repo's!
Especially the Ubuntu one......

The OP is using U21.10, you cannot get more current that that !  (Its not due out for several months ...)
But seriously, distro's release cycles mean you almost never see a current version in the distro's repo.

..... i used gdebi to install deb's, since gdebi resolves dependencies

apt will resolve dependencies, I don't think apt-get does and am sure dpkg does not.  But gdebi is a great little tool for lots of other reasons too.

My advice for all but the very beginner (linux) user is to install FPC from sourceforge (or from a tarball) and download and compile Lazarus. You end up with a heap more flexible system that way. Its what fpcupdeluxe does but by doing it yourself (all three commands ! ) you understand where everything is and how its connected together.

Installing lazarus from debs or rpms (either distro repo or sourceforge) is silly really. Its gets all installed under /usr and the very first time you rebuild the IDE (ie for a package install) that /usr install is ignored, you use the one hidden away in your home directory under the laz config directory.

Davo

[Zvoni]

Dave,

dpkg definitely doesn't resolve dependencies (i remember i had to dpkg some stuff, and it drove me mad to brachiate through the dependencies)

apt-get does resolve dependencies (correct me if i'm wrong, haven't used it in years)

IIRC, yes, you can use apt/apt-get to install from local file (instead from repo), but for me it just wasn't worth the hassle at that time. GDebi and you're set

FPC/Laz from Repo vs. sourceforge-deb's: I definitely remember the Version from repo using different install-paths and missing packages

@Ubuntu21.10: Why in blazes is he using a Beta (if not alpha)-Version of an OS? 21.10 isn't due another 5 months

[mcculloch]

Installation of the three deb packages, as lucamar says, is very easy. There is no point in waiting until it shows up in the Ubuntu repository, which is unlikely to ever be up to date.

You may find some complex instructions for installing on Linux, but it is not really hard. You may need to install libgtk2.0-dev as well though.

Something like:

Code: [Select]

sudo apt-get install libgtk2.0-dev
sudo dpkg -i *.deb
should work. This assumes the 3 deb files are in the current directory using the terminal. You can use three calls to dpkg in order, but this call should do the same.

I'm using Linux Mint 20 and trying to install and got to lazarus which choked because libgtk2.0-dev wasn't installed but when I try and install that, it also has many dependencies that aren't met so it won't install.  Then when I do "sudo apt-get -f install" all it does is remove lazarus-project.  I'm stuck and don't know how to move this forward.  The fpc-laz and fpc-src was installed first and installed successfully.

[mcculloch]

Sorry.  I'm giving up.  I got the dependency down to libc6 that is the major issue and aptitude wants to downgrade some very important packages to fix the problem.  I know that will cause problems with other packages.  If anyone has any ideas, I may pick up the effort to install Lazarus again, but I won't downgrade anything to get it.