Latest flash and old(er) video cards/chips is a nono.
126.96.36.199 working well on my Nvidia 8400GS and ATI 9600 Pro
10.3.183.19 doing the trick on Nvidia Riva TNT2, ATI Radeon and Rage, obscure older low mem video configs.
with the one from the archieved adobe .rpm files
With a Synaptic update with newer flash it will be overwritten,
so pinning of the last installed flash would protect your changes.
Be aware, using older versions could be a security risc.
Choose safe without watching flash, or watching flash with knowing you are in danger