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I upgraded from 12.04 to 13.o4 and like every time I perform an upgrade my system was very slow,and if I closed my laptop and put it in suspend then opened it again the display would not come back. (I am running an HP dv6 laptop quad core with 8 gigs of ram, I don't dual boot. I run only Ubuntu.) So I backed up my data and wiped my system and installed 13.04 from scratch. It is much speedier but still slower than 12.04 especially booting and shutting down. If I close the lid it goes into suspend but when opened back up the display will not come back. The wireless constantly drops and reconnects. It worked fine under 12.04. I am randomly getting errors when loading different apps, one time and not getting errors the next. The headphone jack will not work unless I go to a command prompt and launch alsamixer and enable it each and every time I want to use my headphones.

Please help. Any help would be appreciated. I really want 13.04 and the enhancements it has but I can't keep working this way. Thank You in advance!!

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Suspend already fix in the latest update. Now my laptop can sleep. Other problem would have their own tweak or workaround. Good luck. LOVE Ubuntu! – Shaharil Ahmad May 21 '13 at 3:06

Something to bear in mind with regard to 13.04 vs 12.04: 12.04 is a long-term support (LTS) release and 13.04 is one of the three intermediate releases between the LTS versions. While major Ubuntu releases are fairly stable in general, there will many more instabilities compared with the LTS versions because they use more recent software and contain newer features. In the LTS releases much higher priority is given to software stability and maturity, whereas the releases in between contain reasonably stable software but perhaps not tested as thoroughly. It's not quite "bleeding edge" but it is a lot of newer software and there are likely to be some compatibility issues and breaking of features that used to work.

Unfortunately that's the trade-off you make between LTS and non-LTS releases: new features versus solid stability. However, a lot of the problems encountered in the non-LTS releases get fixed pretty quickly by the Ubuntu community, so if you're comfortable on the terminal you can usually find a post via Google of somebody's hacked together fix. :)

Also, with regard to upgrading, from my own experience and the experiences of others I've read, it's pretty much always better to reinstall new versions from scratch. It's very difficult to make sure the upgrade process works well in all software configurations. I don't worry about it so much for non-critical systems because I'm pretty comfortable fixing the problems myself, but on any machine where I need stability (like my main work PC) I will always back up my junk and install a new version from scratch.

You might try searching for issues related to your particular hardware and the drivers in use. You can figure out this out using the lspci command like so:

anthony@anthony-linpc:~$ lspci

which will give you output with lines like these:

00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
03:00.0 Ethernet controller: Qualcomm Atheros AR8162 Fast Ethernet (rev 10)

Then you can grep the verbose output for the device you're looking for:

anthony@anthony-linpc:~$ lspci -v | grep -A 6 Wireless

which will give you the kernel driver being used:

02:00.0 Network controller: Atheros Communications Inc. AR9485 Wireless Network Adapter (rev 01)
    Subsystem: Lite-On Communications Inc Device 6628
    Flags: bus master, fast devsel, latency 0, IRQ 17
    Memory at f7d00000 (64-bit, non-prefetchable) [size=512K]
    Expansion ROM at f7d80000 [disabled] [size=64K]
    Capabilities: <access denied>
    Kernel driver in use: ath9k

Note what I did is is used lspci with no parameters to get a quick list of my PCI devices (which should include your network adapters and your audio device, among other devices I commented out for brevity). In the second command I use the -v (verbose) option to show me the kernel driver used (for my WiFi card it's the ath9k driver). You might have some luck putting those into Google, e.g. "ubuntu 13.04 Atheros ath9k problems" or something along those lines. (Also, fyi, running lspci with sudo will give you more information, but I don't know how much will be relevant to you for this).

Personally it's been a while (I mean like years) since I've had hardware issues with Linux, so I'd be a bit surprised if it weren't a pretty simple fix. Sometimes the hardest part is figuring out what to ask Google.

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With some of the updates I have noticed a performance difference in speed. However since the most recent updates my wireless has gone from bad to worse. Just to add this here on ask Ubuntu I have to plug into a network cable. The wireless will now rarely connect, and I still have the sound issue with alsamixer and the headphone jack. If you can help please do. I am almost to the point of taking 13.04 off and going back to 12.04. I am trying to avoid that because of I really want to run 13.04. Also Thank You Anthony for your post! – Cayzar May 27 '13 at 19:27
@Cayzar: I added some information which might help you track down issues with your specific hardware. Hopefully that helps more. – Anthony May 27 '13 at 22:44

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