My question is linked to  and expands on it a little. I experience the same behavior of Skype in a fresh install of Ubuntu 15.10. More specifically, when I start Skype immediately after booting into Ubuntu, it will most likely work all right, but if I turn it off at some later time, it will more often than not show up with a completely garbled up and unusable interface such as here (copying the image from the question linked above):    I also observe the same behavior with Clementine. If I open it immediately after starting an Ubuntu session, it will most likely show up ok:    but if I start it some time into the session, it will often display a completely broken interface:    I suspect this may have something to do with the fact that both Skype and Clementine may be using gtk2, and my Ubuntu install does not have some libraries required for proper rendering of these applications, but I am at a loss of how to diagnose the problem more precisely and fix it. Perhaps you could help?
Skype app in my Ubuntu system work perfectly. But today when I run the app, I see this:    How Can I fix this?
How can I change the master volume level? Using this code  [DllImport ("winmm.dll")] public static extern int waveOutSetVolume (IntPtr hwo, uint dwVolume);  waveOutSetVolume (IntPtr.Zero, (((uint)uint.MaxValue &amp; 0x0000ffff) | ((uint)uint.MaxValue &lt;&lt; 16)));   I can set the wave volume but if the master volume is too low this won't have any effect.  Thanks for any help. Introduction to string theory I am in the last year of MSc. and would like to read string theory. I have the Zwiebach Book, but along with it what other advanced book can be followed, which can be a complimentary to Zwiebach. I would like a more mathematically rigorous book or lecture notes along with Zwiebach.   Specifically, mention whether the book discusses string theory   Rigorously? Intuitively?   What's the scope of the book? Does it cover the advanced materials, e.g. Matrix string theory, F-theory, string field theory, etc. Maybe even String Phenomenology? Last digits, numbers Can anyone please help me?  1) Find the last digit of $7^{12345}$   2) Find the last 2 digits of $3^{3^{2014}}$.  Attempt: 1)  By just setting the powers of $7$ we have $7^1 = 7$, $7^2=49$, $7^3=343$, $7^4 = 2401$, $7^5 = 16807$, $7^6 = 117649$, $\dots$  After the power of $4$, the last digits will repeat. Then by noticing the pattern the digits will end in $7,9,3$ and $1$.  Then we can divide the exponent $(12345)$ by $4$ since this is the cycle that makes it repeat. Then $12345 : 4$ has remainder $1$. So $7^1 = 7$ is the unit digit to $7^{12345}$.   So the last digit is $7$.   I know how to do it like this, the problem does not state how to find the last digit, but I know it has something do do with Euler's theorem.  for part $2$) I don't know how to start. Can anyone please help me?   Thank you for the help. I've got a Windows 10 Computer (home edition), which has 4GB of Ram and an i5 processor. I need to run an old 32 bit accounting programme. 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Similar questions have been asked previously but I still don't get it: Big tilde in math mode How do I get a really wide tilde?  I need to cover at least  abcdefghijklmnopqrstuvwxyz  The \widetilde command does not work. Nor using \stackrel with \sim. I have a website running in English and Japanese and the default language is Japanese.  What are the advantages of one over the other solution:   Solution 1. When accessing example.com, you will see only Japanese. When accessing example.com/en, you will see only English. Solution 2. When you access example.com, it will redirect you to example.com/ja, where you will see only Japanese. English site is still example.com/en. Convergence of Power Series with $z^{2^k}$ Hide a Field From ONE User Scenario: If I had a Custom Profile / Standard Profile, say Sales,and I have 50 Users assigned to the same Profile and had same Permission / Access on a particular object (Could be Standard or Custom Object), if I were to Hide a Field ONLY TO ONE USER, which would be  a better Solution to achieve this WITHOUT EDITING OR TOUCHING THE PROFILE??  Option 1: Create a Custom Profile for this particular User and give CRED access (I know this one isn't a good solution as I got a Thumbs-down from a Technical Architect)  Option 2: Create a Permission Set - Go to the particular Object,say, Accounts, Object Permission Enabled -->Field Permissions-->Remove READ Access - This would make this particular field hidden from the Object to the Profile. Then Assign this Permission to particular User whom I don't want to see this field.  I would go with the 2nd option but I still hear a groan. Where am I going wrong? How would you hide a particular field from ONE User out of 10 Profiles who have the same Access Rights?  What's the best possible solution to hide a Filed from only one User out of 10 Users who have the same Profile. Why disable Fast Boot on Windows 8 when having dual booting? Why is everybody keep mentioning to disable Fast Boot on Windows 8 if you have installed alongside Ubuntu? Is it something that is recommended only for UEFI machines or is it a suggestion for Legacy BIOS machines as well? Is it because it makes the Windows partition inaccessible from Linux or there is another more serious reason to disable it? Find the highest order bit in C Ways to obtain new portrait photography clients? I'd like to increase my portrait business. I've had good experiences with family, pet portraits and High School seniors.  My local newspaper is quite expensive. I've had okay luck with Craigslist, although Craiglist shoppers are far from my ideal client that is willing to pay for quality images, fast turn around and a great experience.  I have a flyer on my community message board, but not enough traffic walks by it. I was thinking about posting at my local churches. I get a few of referrals from friends and family of clients.   What are good ways to reach my local base and increase sales? Why is the Petersen graph no Cayley graph? Basic Electronics Book How do I suppress stderr warning messages from a command inside command substitution? touch ~/deleted/$(echo "directory_"$(readlink -f foo)|tr '/' '\') 2&gt; /dev/null   where foo is a directory  It's reading the full pathname of foo and creating it as a file replacing all '/' with '\' and putting a directory_ in front so the directory  /home/test/foo would create a file directory_\home\test\foo  It does exactly what I want except a warning keeps printing tr: warning: an unescaped backslash at end of string is not portable   a. I don't know what that means b. I would like it to not show  I tried to redirect stderr to /dev/null but it doesn't work. How do I suppress it? How can I use variables in the LHS and RHS of a sed substitution? I want to do:  cat update_via_sed.sh | sed 's/old_name/new_name/' &gt; new_update_via_sed.sh   in my program.  But I want to use variables, e.g.  old_run='old_name_952' new_run='old_name_953'   I have tried using them but the substitution doesn't happen (no error). I have tried:  cat update_via_sed.sh | sed 's/old_run/new_run/' cat update_via_sed.sh | sed 's/$old_run/$new_run/' cat update_via_sed.sh | sed 's/${old_run}/${new_run}/' Unique constraint that allows empty values in MySQL How can I determine if someone's SSH key contains an empty passphrase? Some of my Linux &amp; FreeBSD systems have dozens of users. Staff will use these "ssh gateway" nodes to SSH into other internal servers.  We're concerned that some of these people use an unencrypted private SSH key (A key without a . , because if a cracker ever gained access to their account on this machine, they could steal the private key and now have access to any machine which uses this same key. For security reasons, we require all users to encrypt their private SSH keys with a passphrase.  How can I tell if a private key is not-encrypted (e.g. Does not contain a passphrase)? Is there a different method to do this on an ASCII-armored key vs. a non-ASCII-armored key?  Update:  To clarify, assume I have superuser access on the machine and I can read everybody's private keys. What does this black-font Israeli stamp on my Passport mean? I applied for B2 Tourist visa at Israel embassy in New Delhi last week. But my visa application got rejected and stamped a black stamp on my passport.   What does black stamp mean? After how much time should I reapply for tourist visa?