Question: When I open steam, it tells me that I need to download additional packages.

First it says: 
 Failed to fetch <http://dep.playonlinux.com/dists/precise/Release>  

 Unable to find expected entry 'main/binary-armhf/Packages' in Release 
 file.

Then here are the packages it cannot locate:

```
E: Unable to locate package libgl1-mesa-dri-lts-quantal:i386
E: Unable to locate package libgl1-mesa-glx-lts-quantal:i386
E: Unable to locate package libc6:i386

```

I used synaptic and it says that those packages are there but not the i386 versions.

I have tried the following code:

```
sudo apt-get update
sudo apt-get install libc6-i386

```

And that doesnt work. I have been looking through various threads about this all night. Nothing seems to work.

Any help is GREATLY appreciated!

Answer: 
In the end I found this killer oneliner:

```
sed -i '1795,$ {/PaTtErN/d}' file.log 

```

be careful with the `-i` flag and read the manual before trying
Possible with `AWK` , too:

```
bash-4.3$ cat input.txt 
line one
and another line
running out of ideas for text
Oh, look , banana !
some more lines
this is boring
But what is not boring ? text processing !
bash-4.3$ awk 'NR<4; NR>4 && $0!~/banana/' input.txt 
line one
and another line
running out of ideas for text
some more lines
this is boring
But what is not boring ? text processing !

```

The idea here is to print all lines that are less than 4 untouched. Lines greater than 4 that do not contain specific pattern ( in this case the word "banana" ) , will be printed, and obviously those that do contain it won't be printed.