Polls opened at 8am (0500 GMT) across the country. At one polling station - a school in Cairo's Manial district - banners had been hung on the gate by government supporters proclaiming "Yes to Mubarak for the sake of prosperity".
In the first half-hour of voting, only four young women showed up to vote - but there were no locks on the ballot boxes, so polling officials refused to allow any votes to be cast.
Reporting from Cairo, Aljazeera correspondent Leena al-Ghadban said
voter turnout on Wednesday morning was low, pointing out that some citizens had decided not to vote.
Some organisations tracking the elections issued initial reports stating that no voters or judges had shown up in at least two electoral committees in the new Egypt neighbourhood, the correspondent reported.
Coinciding with the vote, the opposition movement Kifaya (Enough), whose protests have marked the run-up to the election, is to hold another anti-Mubarak demonstration on Wednesday at Cairo's main square.
Aljazeera has learned that Kifaya will stage the rally at 12pm (0900 GMT) to underscore its boycott of the elections and its rejection of any vote for Mubarak.
Nour has emerged as the most
serious challenger to Mubarak
In Mansura city, hometown of al-Ghad Party's Ayman Nour, a fierce race is expected as almost all the political parties in Egypt, including the Muslim Brotherhood and al-Wafd Party, are represented.
Aljazeera reporter Amr al-Kahky, on hand at the Ibn Luqman school, the biggest polling centre in Mansura city with 3.2 million voters registered, described the turnout there as low.
But he said he expected more voters to show up later.
From Minyah, where about 1.8 million voters are registered to vote, Aljazeera correspondent Samir Omar said voter turnout was good.
Aljazeera has learned that the national party hired buses to transfer citizens to polling centres to support Mubarak.
Some al-Ghad Party sources also told Aljazeera that the governorate was mobilising citizens in buses to vote for the incumbent.
However, the information had not been confirmed, the correspondent said. Mubarak, who has ruled Egypt for 24 years, is expected to easily win a fifth six-year term in the vote.
But his government says the decision to allow competitors to run against him signals a move towards greater democracy.
Aljazeera's office in Cairo has also received reports that al-Ghad and al-Wafd parties in Port Said and Giza have submitted complaints that electoral officers did not apply indelible ink on the fingers of voters.
A voter shows his finger dipped
in indelible ink
The indelible ink is the main guarantee that a single voter will not cast multiple ballots, the correspondent, Hussain Abd al-Ghani, said.
The two parties have also complained that the ink used could be easily removed from voters' fingers in some areas, he said.
Indelible ink is supposed to stain fingers of voters for at least 24 hours, he added.
Aljazeera has also received complaints from Upper Egypt, or southern Egypt, that 60% to 80% of the supervising judicial committees' members are connected to an association which is directly under the authority of the government's executive arm.
Two main rivals
Nine candidates are running against the 77-year-old leader but only two are considered significant - Nour of al-Ghad Party and Numan Gumaa of al-Wafd Party.
But the country's judges - tasked with supervising the poll - have already warned that they will not endorse the result of the vote, amid suspicion the government will seek to swell an expected low turnout to boost Mubarak's legitimacy.
The country's 9865 polling stations are due to close at 10pm (1900 GMT) to allow Egypt's 32 million registered voters to take part in the poll.
Egyptian public television showed the first pictures of people
casting their ballots.
Mubarak has urged all Egyptians to vote after coming under intense international and domestic pressure for political reform.
Polling will be supervised by thousands of judges as well as
delegates from the candidates' parties but the electoral commission has independent monitors from polling stations, fuelling opposition fears the government has something to hide.
Egypt introduced pluralism with
a constitutional amendment
According to independent estimates, turnout reached barely 10% in the previous plebiscite won by Mubarak. The man dubbed "the last pharaoh" was re-elected in 1999 with 93.79% of the vote.
After three weeks of campaigning, the fiery leader of the liberal Ghad Party - 40-year-old Nour - emerged as the most serious challenge to Mubarak and his most virulent critic.
Although he managed to raise his profile as the leading
opposition candidate, many observers predict second spot could be clinched by Gumaa, who chairs the liberal Wafd Party.
Critics have charged that Gumaa is a token opposition candidate who was prodded into standing by Mubarak's ruling party to strip Nour of votes.
The seven other candidates are virtually unknown.
Egyptian Foreign Minister Ahmed Abul Gheit said on Tuesday he expected the country's first pluralist presidential election to
promote democratic change elsewhere in the region.
Observers noted that despite restrictions on the opposition and
The Muslim Brotherhood was not
allowed to field candidates