In Mint, you should use mintInstall and mintUpdate rather than the ubuntu software center.
However, if you really want to use the ubuntu software center, you could try "pkexec software-center" instead of gksudo.
Also, have you tried running it from terminal in order to see if any error messages come up then ?
In Mint, you should use mintInstall and mintUpdate rather than the ubuntu software center.
However, if you really want to use the ubuntu software center, you could try "pkexec software-center" instead of gksudo.
Also, have you tried running it from terminal in order to see if any error messages come up then ?