A few days ago, my keboard did not type the quotation mark in Matlab (a software I use much). However, it types it in everywhere else in linux. I add a new keyboard layout and the problem was solved, It worked 3 or 4 days just fine.
Yesterday, I found that I cannot type any letters in Matlab, only numbers and special character could be typed. I return to the old keyboard layout but it did not help.
Thanks in advance.