dosemu does not work in 10.04. It did work in 9.10.

[Bob vun Kannon]

Binary package hint: gnome-games

I'm using Ubuntu 10.04. dosemu simply does not function at all. I've installed it twice from the Ubuntu software center and it still does not work. The dosemu title is placed in the Applications/System Tools menu but no window appears when I select it.

This used to work in Ubuntu 9.10 and earlier.

[Dave Gilbert (ubuntu-treblig)]

I've tried it here and it seems to work fine (x86-64) - although I didn't have it previously so maybe it's an upgrade issue.

I suggest try running it from a terminal and see if it gives you any telling errors.

Dave

[Bob vun Kannon (rvkbob)]

Dave,

Thanks for the response.

I did not "upgrade". I wrote over the entire hard drive with a CD.

To get xdosemu to work from the console I had to sudo sysctl -w vm.mmap_min_addr=0

After that, dosemu also works from the Applications menu.

Question: will I have to repeat the sysctl command each time I boot up?

Bob

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[Dave Gilbert (ubuntu-treblig)]

You can put that in /etc/sysctl or as a separate file in /etc/sysctl.d - just add the line

vm.mmap_min_addr=0

Now it's interesting, that's what I was initially going to suggest because I had to do that on a Debian box, but
on this lucid box when I ran dosemu without that it gave me a warning saying it was using an experimental mode that
didn't need that and apparently worked.

Dave

[Bob vun Kannon (rvkbob)]

Many, many thanks. I'll try this.

Bob

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[Bob vun Kannon (rvkbob)]

Many, many thanks. I'll try that immediately.

Bob

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[lemonnier (p-lemonnier1)]

In fact it is very easy to correct tho bug
You need to install this file in the directory etc/sysctl.d

Sincerely
Patrice Lemonnier
Le samedi 01 mai 2010 à 23:55 +0000, Launchpad Bug Tracker a écrit :
> You have been subscribed to a public bug:
>
> Binary package hint: gnome-games
>
> I'm using Ubuntu 10.04. dosemu simply does not function at all. I've
> installed it twice from the Ubuntu software center and it still does not
> work. The dosemu title is placed in the Applications/System Tools menu
> but no window appears when I select it.
>
> This used to work in Ubuntu 9.10 and earlier.
>
> ** Affects: dosemu (Ubuntu)
> Importance: Undecided
> Status: Incomplete
>

[lemonnier (p-lemonnier1)]

In fact it is very easy to correct tho bug
You need to install this file in the directory etc/sysctl.d

Sincerely
Patrice Lemonnier

Le samedi 01 mai 2010 à 22:55 +0000, Dave Gilbert a écrit :
> I've tried it here and it seems to work fine (x86-64) - although I
> didn't have it previously so maybe it's an upgrade issue.
>
> I suggest try running it from a terminal and see if it gives you any
> telling errors.
>
> Dave
>
> ** Package changed: gnome-games (Ubuntu) => dosemu (Ubuntu)
>
> ** Changed in: dosemu (Ubuntu)
> Status: New => Incomplete
>

[lemonnier (p-lemonnier1)]

In fact it is very easy to correct tho bug
You need to install this file in the directory etc/sysctl.d

Sincerely
Patrice LemonnierLe dimanche 02 mai 2010 à 19:07 +0000, Bob vun Kannon a écrit :
> Many, many thanks. I'll try that immediately.
>
> Bob
>
>
> ____________________________________________________________
> 2550% Penny Stock Gains?
> Our last pick exploded 2550% - Join our newsletter for free picks!
> http://thirdpartyoffers.juno.com/TGL3131/4bddcdc6cb5a32ec745st02vuc
>

[lemonnier (p-lemonnier1)]

No it's a bug
In fact it is very easy to correct tho bug
You need to install this file in the directory etc/sysctl.d

Sincerely
Patrice Lemonnier

Le dimanche 02 mai 2010 à 13:25 +0000, Bob vun Kannon a écrit :
> Dave,
>
> Thanks for the response.
>
> I did not "upgrade". I wrote over the entire hard drive with a CD.
>
> To get xdosemu to work from the console I had to sudo sysctl -w
> vm.mmap_min_addr=0
>
> After that, dosemu also works from the Applications menu.
>
> Question: will I have to repeat the sysctl command each time I boot up?
>
> Bob
>
>
> ____________________________________________________________
> Penny Stock Jumping 2000%
> Sign up to the #1 voted penny stock newsletter for free today!
> http://thirdpartyoffers.juno.com/TGL3131/4bdd7d61b35a5228a6est03vuc
>

[Dave Gilbert (ubuntu-treblig)]

So I've marked this as confirmed, since it seems that people are seeing it; however I'm confused.

On my lucid box (which dosemu wasn't previously installed upon) when I run dosemu it says:

------------
EXPERIMENTAL: using non-zero memory base address 0x110000.
You can use the better-tested zero based setup using
sysctl -w vm.mmap_min_addr=0
as root, or by changing the vm.mmap_min_addr setting in
/etc/sysctl.conf or a file in /etc/sysctl.d/ to 0.
------------

so I wonder why it doesn't do that for Bob?
(The dosemu I have is dosemu 1.4.0+svn.1999 in Lucid)

If the experimental thing does work it would be better; the mmap_min_addr is a security mechanism that aims to stop
kernel bugs being exploited for anything nasty, putting that down to 0 removes that protection.

Dave

[lemonnier (p-lemonnier1)]

There is no bug in the ubuntu 64B
But effectively the bug exists in Lubuntu Xubuntu and ubuntu 10.04

It is very easy tou correct.
In a terminal you can with sudi gedit create the file 90-dosemu.conf

Or woth sudao nautilus you can save the attached file in the directory
/etc/sysctl.d/90_dosemu.conf
And it will works marvelous.
The same problem exist for win.
Best regards
Patrice LEMONNIER

Le lundi 03 mai 2010 à 11:08 +0000, Dave Gilbert a écrit :
> So I've marked this as confirmed, since it seems that people are seeing
> it; however I'm confused.
>
> On my lucid box (which dosemu wasn't previously installed upon) when I
> run dosemu it says:
>
> ------------
> EXPERIMENTAL: using non-zero memory base address 0x110000.
> You can use the better-tested zero based setup using
> sysctl -w vm.mmap_min_addr=0
> as root, or by changing the vm.mmap_min_addr setting in
> /etc/sysctl.conf or a file in /etc/sysctl.d/ to 0.
> ------------
>
> so I wonder why it doesn't do that for Bob?
> (The dosemu I have is dosemu 1.4.0+svn.1999 in Lucid)
>
> If the experimental thing does work it would be better; the mmap_min_addr is a security mechanism that aims to stop
> kernel bugs being exploited for anything nasty, putting that down to 0 removes that protection.
>
> Dave
>

[Dave Gilbert (ubuntu-treblig)]

Patrice: Please stop repeating the same answer.