ubuntu package management question

[Robert Heller]

If one wants to install some program or library and knows the name of the
program or library how does one find out what the *package name* is?  Is there
no utility like 'yum search' (available on RedHat flavored systems)?

Specificly, I need qmake for QT5 installed on a Ubuntu 18.04 system.  What
package do I install?  dpkg-query is no help.  Or must I search through the
_Package files in /var/lib/apt/lists/?  Is there no better way? Has noone
created a utility for this?

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[Peter Teuben-2]

if you have it, and you wanted to  know it

         dpkg -S `which qmake`
qtchooser: /usr/bin/qmake

if you don't have it, apart from google , you can type the command,
ubuntu often then tells you the package name.

On 12/11/20 9:44 AM, Robert Heller wrote:
> If one wants to install some program or library and knows the name of the
> program or library how does one find out what the *package name* is?  Is there
> no utility like 'yum search' (available on RedHat flavored systems)?
>
> Specificly, I need qmake for QT5 installed on a Ubuntu 18.04 system.  What
> package do I install?  dpkg-query is no help.  Or must I search through the
> _Package files in /var/lib/apt/lists/?  Is there no better way? Has noone
> created a utility for this?
>

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[Chris Green]

On Fri, Dec 11, 2020 at 09:44:03AM -0500, Robert Heller wrote:
> If one wants to install some program or library and knows the name of the
> program or library how does one find out what the *package name* is?  Is there
> no utility like 'yum search' (available on RedHat flavored systems)?
>
> Specificly, I need qmake for QT5 installed on a Ubuntu 18.04 system.  What
> package do I install?  dpkg-query is no help.  Or must I search through the
> _Package files in /var/lib/apt/lists/?  Is there no better way? Has noone
> created a utility for this?
>
You need 'apt-file' which you will probably need to install too as
it's not installed by default.  Then it's easy:-

    apt-file search <name of file>

Will provide the name of the package which provides the file.  You can
put a full path such as /usr/bin/qmake if just qmake produces too many
hits.

I've just done it for you:-

    chris$ apt-file search  /usr/bin/qmake
    gridengine-client: /usr/bin/qmake_sge    
    qtchooser: /usr/bin/qmake

So you need to install qtchooser.

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[Liam Proven]

On Fri, 11 Dec 2020 at 15:46, Robert Heller <[hidden email]> wrote:
>
> If one wants to install some program or library and knows the name of the
> program or library how does one find out what the *package name* is?

Personally my go-to tool is Synaptic. Yes, GUI app, I'm a weenie etc.


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[Robert Heller]

At Fri, 11 Dec 2020 09:50:12 -0500 "Ubuntu user technical support,  not for general discussions" <[hidden email]> wrote:

>
> if you have it, and you wanted to  know it
>
>  Ã‚ Â Â      dpkg -S `which qmake`
> qtchooser: /usr/bin/qmake
>
> if you don't have it, apart from google , you can type the command,
> ubuntu often then tells you the package name.

Not in this case.  There is actually a file /usr/bin/qmake, which is a symlink
to qtchooser, which when run gives the error:

gollum% /usr/bin/qmake
qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file
or directory

Which suggests that qtchooser is wanting qt4's qmake, which is NOT what I want
-- I have an app that needs qt5, not qt4. I do have (some?) of the qt5
libraries (don't know for sure if I have the -dev libs, but I think I can deal
with that).

For some things the "hack" of typing the command to get the package name is
does not work.  And it is really tiresome to have do web searches, esp. since
often as not, the results are often not usefull or are for a different version
or are outdated.  The really should oughta be a proper package management
utility for this.  Why isn't there such a utility?  Maybe I'll hack some quick
and dirty tool.

>
> On 12/11/20 9:44 AM, Robert Heller wrote:
> > If one wants to install some program or library and knows the name of the
> > program or library how does one find out what the *package name* is?  Is there
> > no utility like 'yum search' (available on RedHat flavored systems)?
> >
> > Specificly, I need qmake for QT5 installed on a Ubuntu 18.04 system.  What
> > package do I install?  dpkg-query is no help.  Or must I search through the
> > _Package files in /var/lib/apt/lists/?  Is there no better way? Has noone
> > created a utility for this?
> >
>

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[Chris Green]

On Fri, Dec 11, 2020 at 04:03:50PM +0100, Liam Proven wrote:
> On Fri, 11 Dec 2020 at 15:46, Robert Heller <[hidden email]> wrote:
> >
> > If one wants to install some program or library and knows the name of the
> > program or library how does one find out what the *package name* is?
>
> Personally my go-to tool is Synaptic. Yes, GUI app, I'm a weenie etc.
>
While I too use synaptic a lot it doesn't always do what the OP
wanted. If you search for the OP's 'qmake' in synaptic then it
offers:-
    qt5-make
    qt5-make-bin
    qconf

None of these provides qmake as far as I know.  qt5-make provides
/usr/bin/x86_64-linux-gnu-qmake which might actually be what the OP
wants, but I'm not sure.

If the OP really wants qmake then qtchooser is the package to provide
it (as per my other reply to this thread).

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[Robert Heller]

At Fri, 11 Dec 2020 16:03:50 +0100 "Ubuntu user technical support,  not for general discussions" <[hidden email]> wrote:

>
> On Fri, 11 Dec 2020 at 15:46, Robert Heller <[hidden email]> wrote:
> >
> > If one wants to install some program or library and knows the name of the
> > program or library how does one find out what the *package name* is?
>
> Personally my go-to tool is Synaptic. Yes, GUI app, I'm a weenie etc.

I *hate* GUI package management tools. I generally avoid GUI apps, except
those that "make sense" as GUI apps (like gimp or CAD programs).

>
>

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[Robert Heller]

At Fri, 11 Dec 2020 15:11:23 +0000 "Ubuntu user technical support,  not for general discussions" <[hidden email]> wrote:

>
> On Fri, Dec 11, 2020 at 04:03:50PM +0100, Liam Proven wrote:
> > On Fri, 11 Dec 2020 at 15:46, Robert Heller <[hidden email]> wrote:
> > >
> > > If one wants to install some program or library and knows the name of the
> > > program or library how does one find out what the *package name* is?
> >
> > Personally my go-to tool is Synaptic. Yes, GUI app, I'm a weenie etc.
> >
> While I too use synaptic a lot it doesn't always do what the OP
> wanted. If you search for the OP's 'qmake' in synaptic then it
> offers:-
>     qt5-make
>     qt5-make-bin
>     qconf
>
> None of these provides qmake as far as I know.  qt5-make provides
> /usr/bin/x86_64-linux-gnu-qmake which might actually be what the OP
> wants, but I'm not sure.
>
> If the OP really wants qmake then qtchooser is the package to provide
> it (as per my other reply to this thread).

But qtchooser is installed and wants to use qt4's qmake (which is not actually
installed).  I think the qtchooser package is either broken or there is some
additional magic.  I did install qt5-make, but I need to specify the full path
(/usr/lib/x86_64-linux-gnu/qt5/bin/qmake) as this *appears* to be only way to
run it.

>

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[Tom H-4]

On Fri, Dec 11, 2020 at 3:46 PM Robert Heller <[hidden email]>
wrote:

>
> If one wants to install some program or library and knows the name
> of the program or library how does one find out what the *package
> name* is? Is there no utility like 'yum search' (available on
> RedHat flavored systems)?
>
> Specifically, I need qmake for QT5 installed on a Ubuntu 18.04
> system. What package do I install? dpkg-query is no help. Or
> must I search through the _Package files in /var/lib/apt/lists/?
> Is there no better way? Has noone created a utility for this?

Install "apt-file" and search.

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[Tom H-4]

On Fri, Dec 11, 2020 at 4:05 PM Robert Heller <[hidden email]>
wrote:
>
> Not in this case.  There is actually a file /usr/bin/qmake, which
> is a symlink to qtchooser, which when run gives the error:
>
> gollum% /usr/bin/qmake
> qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake':
> No such file or directory

$ apt-file search -x ".*qmake$"
qt5-qmake: /usr/bin/x86_64-linux-gnu-qmake
qt5-qmake: /usr/lib/x86_64-linux-gnu/qt5/bin/qmake
qt5-qmake-bin: /usr/lib/qt5/bin/qmake
qtchooser: /usr/bin/qmake
root lap /home/root
$

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[Robert Heller]

At Fri, 11 Dec 2020 18:38:48 +0100 "Ubuntu user technical support,  not for general discussions" <[hidden email]> wrote:

>
> On Fri, Dec 11, 2020 at 4:05 PM Robert Heller <[hidden email]>
> wrote:
> >
> > Not in this case.  There is actually a file /usr/bin/qmake, which
> > is a symlink to qtchooser, which when run gives the error:
> >
> > gollum% /usr/bin/qmake
> > qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake':
> > No such file or directory
>
> $ apt-file search -x ".*qmake$"
> qt5-qmake: /usr/bin/x86_64-linux-gnu-qmake
> qt5-qmake: /usr/lib/x86_64-linux-gnu/qt5/bin/qmake
> qt5-qmake-bin: /usr/lib/qt5/bin/qmake
> qtchooser: /usr/bin/qmake
> root lap /home/root
> $

qtchooser seems to default to qt4 and I couldn't figure out how to make it use
qt5's qmake.  I ended up creating a symlink: /usr/bin/qmake5 =>
/usr/lib/x86_64-linux-gnu/qt5/bin/qmake and was able to build the package I
needed to build.

>

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