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Using the same ALSA upgrade script as for 1.0.20, but with some minor tweaks, you can upgrade to ALSA 1.0.21 by running a simple sh file.

For instructions on how to run the script and other MUST READ info, please check our ALSA 1.0.20 upgade script post.

Once you do that, you can download the ALSA 1.0.21 upgrade script from HERE.

One note: if this error occurs:

checking form.h presence... yes
checking for form.h... yes
checking for new_panel in -lpanelw... no
configure: error: panelw library not found 

You will need to add those symbolics links (only if you got the error) and restart the installation from the last "sudo ./configure" :

sudo ln -s libpanelw.so.5 /usr/lib/libpanelw.so
sudo ln -s libformw.so.5 /usr/lib/libformw.so
sudo ln -s libmenuw.so.5 /usr/lib/libmenuw.so
sudo ln -s libncursesw.so.5 /lib/libncursesw.so 

For manually upgrading to ALSA 1.0.21, see THIS POST.

Once again, credits for ALSA upgrade script go to soundcheck user @ ubuntuforums.