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I have just bought an Acer Aspire One 725. Before trying anything else I installed lubuntu 13.04 immediately. I have no sound whatsoever, (youtube videos, CDs, mp3s, DVDs). How can I find if this a a hardware or lubuntu missing driver problem?

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Have you checked if something is muted? Try alsamixer – MakisH Jun 9 '13 at 18:27
I have checked the mute. It toggles with Fn+F8. By the way, is there any icon in lubuntu for sound? I do not see any in the desktop. How can I try alsamixer? Search it in 'Synaptic Packet Manager' and install it? – Georgios Jun 10 '13 at 6:50
I have found the alsamixer. There are three sound card options: - (default) 0 HD-Audio Generic 1 HD-Audio Generic. It seems there are two cards, 0 ATI R6xx HDMI 1 Realtek ALC271X. I have unmuted both. Only the Realtek showed adjustable bars. Still no sound. Any further help? – Georgios Jun 10 '13 at 15:50

I have partially solved my problem by installing 'Kmix' from Lubuntu Software Center. Now I have audible streaming from youtube and internet radio. But still no sound when I try to play mp3 with Alsaplayer, Audacious, GNOME MPlayer. At least I know my new Acer Aspire One 725 is not faulty. This is frustrating though. Lubuntu is supposed to be ideal for netbooks and the AO 725 is the newest and most common in the market. It has an ATI Wrestler HDMI Audio card (Radeon HD6250/6310)

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I tried on CD-ROM lubuntu 11.10 and lubuntu 12.04. No sound and no video on youtube either. My net book is an Acer Aspire One 725. Then I installed lubuntu 13.04 in an other Acer Aspire One D255 alongside Windows XP. In this older netbook lubuntu functioned OK, everything worked, video and sound. Finally I gave up trying to configure lubuntu 13.04 on the Aspire One 725. I installed ubuntu 12.04 LTS. Now the 725 works flawlessly. It seems that lubuntu could not find by itself what drivers were necessary for sound and video on the 725 and download them automatically. The answer is: if lubuntu does not work on a machine try ubuntu.

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to fix the difficulties with the audio settings in Lubuntu, i suggest installing pulseaudio and pavucontrol:

sudo apt-get install pulseaudio pavucontrol

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