malko su specificniji uslovi, posto je u pitanju upgrade sa starije na noviju verziju ubuntu-a, ali rekao bih da je opet dovoljno cest scenario posto:
1) prilicno je uobicajeno da uradis upgrade u nekom trenutku
2) thunderbird je relativno uobicajen mail klijent
3) koristio sam regularne repo-e
4) koliko vidim nisam jedini koji je prijavio taj problem - bilo je nekoliko korisnika koji su prijavili isti bug, sto ce reci da je bilo daleko vise korisnika sa istim problemom
itd.
now, ono sto bih ocekivao kao tipican OSS community odgovor:
1) why don't you use evolution dude, it rocks - it doesn't rock, it's an utter piece of crap and bad outlook copy.
2) you have the source luke - yes i have, thank you and i am very thankful for an opportunity to waste my life in order to read email, it's a task that goes beyond my pale existence.
3) whoah... it doesn't happen to me man, you must be doing something bad - like what? badly performed bulgarian dance?