As of July 1, 2001, a Swedish citizen who acquires citizenship in another country will be allowed to keep the Swedish citizenship, if the other country permits it. By the same token, if you become a Swedish citizen you can keep your foreign citizenship if the laws of that country permit it. In Uganda it is allowed to have dual citizenship only when you are over 18 years old.
Those who lost their Swedish citizenship as a result of acquiring citizenship in another country before July 1, 2001, were able to regain their Swedish citizenship through notification before July 1, 2003.
On April 1, 2015, the law was further amended and now anyone who lost his/her Swedish citizenship due to applying for another country's citizenship may submit a request to become a Swedish citizen again.
It is advisable for persons with dual citizenship to bring both passports when travelling between the two countries.
You can read more about Swedish or dual citizenship at the web page of The Swedish Migration agency..
