Unable to start midnight commander under Ubuntu. It's a server, where I was using it for a lont time always. Today I logged in and found mc hangs on start.  dims@sagittarius-a:~$ mc   and nothing happens.  Reinstall didn't help.  Removing config  rm -rf .config/mc   didn't help.  Removing global config  sudo rm /etc/mc   and reinstall causes  dims@sagittarius-a:/etc$ mc sfs_init(): Warning: file /etc/mc/sfs.ini not found   i.e. didn't help and config files didn't restored dusring install by some reason.  What else can be tried?  UPDATE  Wow! It just loads long! No less than 60-100 seconds. It appeared while I was writing this. So the question persists: what does it do so long? Calculating mass of proton? How to wean it from this habit?  UPDATE 2  Reinstalling MC doesn't help.  UPDATE 3  Recently I configured my globally the domain name, which I am using as default in my LAN. Now, the commands like  dims@sagittarius-a:~$ host anything anything.MYDOMAIN is an alias for MYDOMAIN. MYDOMAIN has address GLOBAL_IP_OF_MY_SITE_1 MYDOMAIN has address GLOBAL_IP_OF_MY_SITE_2   I , that MC does some DNS lookup on startup and it can slow the process. I would like to understand, what is happening to make my own correct configuration, because answers in that question are incomplete.
Is there any way to prevent mc from taking 10-30 seconds to open?
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Since $$ E[(\bar X -\lambda )^2]= E[(\bar X)^2]+E(\lambda)^2-2\lambda E(\bar X) , $$  I get $$ \lim_{n\to \infty} E[(\bar X -\lambda )^2] =    \lim_{n\to \infty} {2 \over \lambda ^2 }+\lambda^2-2 . $$ Clearly this is not equal to $0$. How can I show this is consistent? I tried using Chebechev inequality as well. But even using that I couldn't.    2) Is $X_{(n)}$ a consistent estimator for $\lambda$? If $P[|X_{(n)}-\lambda|&lt;\epsilon]$ approaches $1$ as $n$ goes to infinity for all $\epsilon &gt; 0$ then $X_n$ is a consistent estimator for $\lambda$.    The probability density function of $X_{(n)}$ is $f_n(x) = n \lambda e^{-\lambda x}(1-e^{-\lambda x})^{n-1}$,  for $X&gt;0$.  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I would like to split pages in pdf so that each page would be divided into 2 pages ( e.g. form 100 pages I would go into 200 but smaller - exactly half size).  I need this to read pdfs on my ebook reader.  Anybody knows how can this be done ? newenvironment: error with \begin{align} and \end{align}