Among critical scholars, the Lucifer mentioned in Isaiah and Daniel is not considered the same as Satan.
Isaiah chapters 13-23 describes a series of “burdens” on various nations, e.g. Babylon, Tyre, Egypt. Then specifically in 14:4:
That thou hast taken up this simile Concerning the king of Babylon, and said, How hath the exactor ceased
The prophecy is therefore about the human king of Babylon, who is described as “Lucifer”, and verse 16 describes his fall:
Thy beholders look to thee, to thee they attend, Is this the man causing the earth to tremble, Shaking kingdoms?
So this clearly refers to a king like any other, verses 9-10 affirm this:
Sheol beneath hath been troubled at thee, To meet thy coming in, It is waking up for thee Rephaim, All chiefs ones of earth, It hath raised up from their thrones All kings of nations. All of them answer and say unto thee, Even thou hast become weak like us! Unto us thou hast become like!
The later association with the devil comes from the opening words of verse 9: sheol in Judaism is originally the place where all dead go. In later eras, it became the destination for the wicked and a place of punishment.
As to your specific question about hubris, we first need to identify to which king Isaiah is referring. “Lucifer” means “the morning star”, which is the brightest of the stars. In the parable, this star proudly decides to “ascend into heaven (which by the way contradicts the later association with Satan, who was cast out of heaven). This is described in verse 13:
And thou saidst in thy heart: the heavens I go up, Above stars of God I raise my throne, And I sit in the mount of meeting in the sides of the north.
Philologists associate this with Nebuchadnezzar, based on for example Daniel 4:22. Nebuchadnezzar proudly surveyed the great kingdom he had built up, thinking that he had conquered other nations in his own strength, rather than recognizing that the Abrahamic deity had bestowed this:
Thou it is, O king, for thou hast become great and mighty, and thy greatness hath become great, and hath reached to the heavens, and thy dominion to the end of the earth;
The association with the casting out of the devil comes from Jehova's punishment as described in Daniel 4:33, which references the king by name:
'In that hour the thing hath been fulfilled on Nebuchadnezzar, and from men he is driven, and the herb as oxen he eateth, and by the dew of the heavens his body is wet, till that his hair as eagles' hath become great, and his nails as birds.'
So Nebuchadnezzar's hubris is the cause for his downfall in the OT. The entire story is clearly about a king, not a fallen angel. The consensus among critical scholars is that the book of Daniel is historical fiction. Nebuchadnezzar's recognition of the power of Yahweh is unlikely to have actually occurred.