using Gaussian 16 under CentOS 7
 

I would like to use Gaussian 16 (a theoretical chemistry software) under Linux. My PC is a 32 bit windows 7 OS one. I have a 4 GHz processor and 4 Gbyte RAM. Does anyone have experience using Gaussian with the CentOS linux version?
I plan to create a bootable pendrive with CentOS 7 on it and boot my PC from it.

There is this note in the binary installation instructions:
CentOS is not listed, specifically, 'tho it may be supported as it's a rebranded RHEL.

Given that Gaussian 16 is a paid product, recommend you ask your specific question of their support. They'll need to be on board with the idea in any event. You don't want to pay for a license and then be told you're doing something unsupported later.

Further questions
 

Hi Sean,

Thank you for your comments. Yes I have asked Gaussian Co. and they told me they have not checked CentOS for Gaussian 16 but think that it might perform well as they have not received complaints in this respect. I would like to ask you some more questions in connection with this topic. As I am indeed a Linux newbie (although many years ago I used UNIX) I would greatly value your advice!

So I have read about CentOS-7 and it appears to be OK for 32 bit PCs. I can download the corresponding ISO image file, but how to install CentOS on a pendrive that I could use for booting my PC? Can you perhaps recommend an appropriate installation program for this purpose?

Thanks for your attention

László Nemes PhD DSc science advisor emeritus
HUngarian Academy of Science
Budapest

There are many how-tos to be found on the 'net about making a bootable pendrive. I've only done so to install to the hard drive, which is not what you want to do.

You should also include "persistent" in your search terms to insure that any changes you make while running from the pen drive get saved, given that you're planning to install software on the drive.

Mayhaps someone who knows more than I will jump in here with more specifics.

persistent?
 

Hi Sean,

Please help what do you mean by 'persistent'? Should I include in my search 'persistent setup...'? Or something else?

Thanks for your help

Greetings László

Usually bootable disks or drives are read-only, so changes made while the system is running are not saved...are not persistent.

Try searching for something like "centos bootable usb drive persistant" (no quotes).

CentOS question
 

Hi Sean,

Yet another question to you:

I successfully downloaded iso files for centos-7 and I also get the SHA-256 checksums with them. How can I ascertain (before installing CentOS) that these checksums are OK. There are no PGP numbers on the particular download mirror I am using here in Budapest. I read on the web that pgp numbers are needed.

Regards László

Did you download the 32 bit version?
http://isoredirect.centos.org/altarch/7/isos/i386/

CertUtil is a windows utility that should already be installed that can compute sha256 sums. PGP is used to connect to the repositories and are installed when the operating system is installed.

certutil in win 7
 

Hi Michael,

Should I then use the command line in win 7

certutil-hashfile (name of ISO) sha-256

Yes I downloaded CentOS-7 for my 32 bit windows 7 PC (in fact both the full and the minimal ISOs)

Yes. Make sure you are in the directory where the iso is located or use the full path

certutil -hashfile filename SHA256 (be mindful of the spaces.)

Hi Michael,

I have a new question to you. I have tried to install CentOS-7 on my 64 gigabyte pendrive using Etcher. The iso was the following:

CentOS-7-i386-Minimal-1810.iso, however Etcher reported that 'this ISO is not a bootable image, does not appear to contain a partition table and might not be
bootable' Indeed it did not boot. Now somebody suggested that this might be due to the 64 bit structure of the ISO. But my processor is characterized as a 64 bit one on Microsoft page (my processor on my win 7 PC is: Intel Core i3 2100 at 3.10 GHz). So I do not have a 32 vs 64 bit conflict (unless it matters that my win 7 is a 32 bit one).
So what could cause the non-booting problem? Do you have an idea, I wold be very grateful as I am spending a lot of time and still cannot install CentOS-7 on my pendrive. Do I have to partition my pendrive first? I thought that this jopb is done by the ISO flashing Etcher application.


Best László

Not all Windows USB install programs work the same for all distributions. CentOS recommends Fedora media creator.

https://docs.centos.org/en-US/centos...a_USB_Windows/

Hi Michael,

My troubles are now even greater. I installed Fedora Media Writer and tried to use the CentOS ISO with it on my 64 gigabyte pendrive. It carried out the writing and in the end it told me to remove the downloaded ISO from the pendrive. I did it and then it offered my pendrive and a Raspberry as well. I chose my pendrive, shut the PC down and without removing the pendrive I tried booting from it. It did not boot, instead it booted windows. And the pendrive disappeared from my devices completely, my PC does not see it any more.

What should I do? Do I have to reformat it? But how when my PC does not see it any more?

Please advise

László

What is more I inserted the pendrive into my other (win xp) PC and it sees it but declares it non-formatable. How to cure my pendrive??????

As to my last (so far unanswered questions). Somebody told me that for installing linux on a pendrive, I cannot use an ISO on my PC harddrive but that I should use two pendrives. One of them I have to put the iso file and make it make bootable, and the system should be installed on another pendrive. Is this the right process? Please advise

László