[Ham-Computers] Linux Questions - More

[Jim Hill]

Thanks for the security info; I'll need to learn more about Firefox 
and the settings..

More questions:
In Windows XP, I can right click on the desktop to get the Display 
Properties and from there change the screen resolution, refresh rate, 
and DPI (changes font size).  How can I change these properties when 
using using Linux?  White screens have an annoying flicker and the 
font size on the desktop screen is really small, probably less than 8 points.

I currently have a dual boot Linux setup, where I can choose between 
my old version (5.1) and the current version (9.10).  Nothing magical 
about this configuration, the hard drive I used contained 5.1 and I 
was given the choice of 9.1 only or both during setup.  If problems 
occurred when using 9.1, I could reboot and check 5.1 to see if the 
same problem existed.  It's a 40GB hard drive, which I assume is of 
adequate size for both versions.

While Linux was running, Firefox updated, and to my surprise the 
following appeared:
"The upgrade needs a total of 400M free space on disk "/".  Please 
free at least an additional 231M of disk space on "/".  Empty your 
trash and remove temporary packages of former installations using 
"sudo apt-get clean".  I'll need to read my Ubuntu book and come up 
to speed, but have a few questions?

Is there a Linux-equivalent of Partition Magic where I can view the 
partitions, see how much is currently used, and resize 
partitions?  There must be much plenty of space somewhere, since I 
have saved nothing except a few bookmarks.

What is the Linux equivalent of Windows Explorer?

I had hoped to be an Linux "appliance operator" while checking credit 
card web sites, and then learn about the file system, etc., but it 
looks like I'm not that lucky.  I feel fortunate I selected Ubuntu, 
where a book was available.  But, that's one of the reasons I chose 
Ubuntu while we floundered through a Debian class about 5 years ago.

Jim