Assuming that you don't already have a /usr/lib64, and you're running a 64-bit arch or don't mind letting 64-bit code think you are, it shouldn't be an issue.
What you're doing is creating a link for code that looks specifically for 64-bit libraries to point them at the default library directory. Some code that *really* wants to only run 64-bit may be confused and crash, but the main system, kernel, and core libraries shouldn't have any issues.
Most likely (this is speculation, though, having not investigated this particular issue) there's a bug in the Unity system where it's assuming that only 64-bit architectures exist (bad Ubuntu, bad bad Ubuntu), and has linked specifically to the lib64 libraries, even when compiled for i686.
Note, if it somehow causes a problem, merely removing the link would "fix" the problem; something easily done from the recovery console of Grub2.
All-in-all this seems pretty safe.
Hopefully that helps to clarify the effects of creating that particular link.
On 07/24/2013 08:52 PM, Dazed_75 wrote:
> I already did the research. I was more referring to the fact that I have
> no clue as to the impact of making that link. Sorry, I should heve been
> clearer in my question.
>
>
> On Wed, Jul 24, 2013 at 6:28 PM, <kitepilot@kitepilot.com> wrote:
>
>> That instruction is creating a soft link that by all accounts should be
>> already there.
>> It is harmless as it is. but you should:
>> man ln
>> and investigate the options for you own sanity.
>> Free advice, can't sue me... :)
>> ET
>>
>>
>> Dazed_75 writes:
>>
>>> I am having some troubles with Ubuntu 12.04.2. After some upgrade (maybe
>>> to catalyst13), unity no longer runs. I have tried many fixes with no
>>> luck. I actually ran Cinnamon for several weeks, then discovered that
>>> Unity 2D works but has unfortunate appearance issues. The I found:
>>> http://xpressrazor.wordpress.**com/2013/07/22/install-**
>>> catalyst-driver-in-ubuntu-12-**04-2/<http://xpressrazor.wordpress.com/2013/07/22/install-catalyst-driver-in-ubuntu-12-04-2/>
>>> but there is a step that makes me worry:
>>> cd /usr ; sudo ln -svT lib /usr/lib64
>>> Should I be concerned about that?
>>> --
>>> Dazed_75 a.k.a. Larry
>>> Please protect my address like I protect yours. When sending messages to
>>> multiple recipients, use the BCC: (Blind carbon copy). Remove addresses
>>> from a forwarded message body before clicking Send.
>>>
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