So are you suggesting me to switch to Bitcoin Core, I can install it in my laptop as in my PC I don't have that much space left. Is Bitcoin core more secure than electrum, if thats the case I am giving it a try, hopefully it will run on Linux.
You can enable pruning in Bitcoin Core as well, then 5 GB HDD storage is enought. But the synchronizing might take long anyway, depending how fast your computer and internet connection is. Electrum advantage is it is instaneous, no long synchronizing necessary, but one of the electrum disadvantage is all your Bitcoin addresses are know to the electrum server where you connect to query your Bitcoin ballance.