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On several Ubuntu 10.04.4 LTS systems I've recently upgraded to Thunderbird 11.01.1 to 12.04 via "apt-get update/upgrade". Now my T-Bird menu's drop off un-expectantly; trying to click on "Get Mail" sometimes fails intermittently; and printing is also intermittent. I did not have these intermittent problems before upgrading. How do I revert Thunderbird to the previous release until the developers fix these issues?

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To downgrade a package in ubuntu will follow this way

sudo apt-get install <pkg_name=Version>

in the version name place the version you want .

i mean like sudo apt-get install thunderbird=11.01.1

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