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Ubuntu: How to do a release upgrade (example: 14.10 -> 15.04) on the command-line?

+1 vote
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Ubuntu: How to do a release upgrade (example: 14.10 -> 15.04) on the command-line?
posted Aug 7, 2015 by Abhay

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+1 vote

I am thinking of upgrading from 10.04 to 12.04, just a click away in the software centre (no particular reason other than to benefit from recent fixes and continued support).

There are probably no easy answers (though I'd like some brief ones), but I wonder how common soft/hardware in/compatibility related problems are, resulting from such an upgrade?

Also, I am assuming all custom configurations will remain unchanged after such an upgrade (default email and custom settings, www browser bookmarks, various .rc files, repository settings for auto upgrades of unsupported software, and such), please correct me if should not assume so.

+1 vote

When going to the web site all see is Index of / and the page like you would see when doing a directory list, but it is blank (no files listed - just the apache version, etc.). I have looked in the logs and have checked the apache conf files and it looks the php module is set to load, but the index.php is not loading.

Any suggestions?

+2 votes
in mycase of tomcat error on ubuntu 14.04 too many files open, 
even though limit is 8096, proc limit says 4096. why ? any body?          
ranjan@ubuntu:~$ cat /proc/22897/limits          
Limit                     Soft Limit           Hard Limit           Units     
Max cpu time              unlimited            unlimited            seconds     
Max file size             unlimited            unlimited            bytes     
Max data size             unlimited            unlimited            bytes     
Max stack size            8388608              unlimited            bytes     
Max core file size        0                    unlimited            bytes     
Max resident set          unlimited            unlimited            bytes     
Max processes             56045                56045                processes     
Max open files            4096                 4096                 files     
Max locked memory         65536                65536                bytes     
Max address space         unlimited            unlimited            bytes     
Max file locks            unlimited            unlimited            locks     
Max pending signals       56045                56045                signals     
Max msgqueue size         819200               819200               bytes     
Max nice priority         0                    0     
Max realtime priority     0                    0    
Max realtime timeout      unlimited            unlimited            us     
ranjan@ubuntu:~$ sysctl -a |grep file     
sysctl: permission denied on key 'fs.protected_hardlinks'     
sysctl: permission denied on key 'fs.protected_symlinks'     
fs.file-max = 1426057     fs.file-nr = 8096       0       1426057     
sysctl: permission denied on key 'kernel.cad_pid'     
fs.xfs.filestream_centisecs = 3000     
+1 vote

I use Unity and have a bluetooth button in my status bar. When I switch off bluetooth with this
button, my hardware LED still tells bluetooth is on!

Do you have any idea how I can get this bluetooth software switch working?

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