Citroen C5 cant select a gear first lost 2nd then reverse then nothing. no warning lights and ticks over fine

cant select a gear first lost 2nd then reverse then nothing after hearing and feeling some frictions and grinding in gear the gear box moved when pulling away in first gear. I have just replaced bottom suspension bushes on front last week and put through MOT and it passed and then took for tracking to be set and next day this happened in a total of 5 minutes had to push into a space